Alternate spellings: Isaac, Isaak, Jssak.


Isak Mamo Abraham was born on September 16, 1883, in Rustchuk, Bulgaria. He was the third son of Mamo Abraham and Lea Jacob.

By the time he was ten years old, both his parents had died of tuberculosis. He was then raised by his maternal grandparents, Salomon (Moni) and Rebecca Jakob.

Nothing else is known about his early life.

Isak Abraham, age 13, Rustchuk, 1896

Isak Abraham, age 13, Rustchuk, 1896.


Nothing is known about Isak's young adult life. The only document so far is this photograph of Isak holding a bicycle. Although undated, it must have been taken in the early 1900's, when Isaak was in his early 20's.

Isak Abraham

Unknown location and date.

Collection of Iris Eldar Nir


Unlike his brothers Haim, Moritz and Mony, Isak apparently never moved to Constantinople. Instead he spent his early adult years in Varna, Bulgaria.

Varna was a large port on the Black Sea, the third largest city in Bulgaria and the second most important business center.

One of the very few surviving documents related to Isak is his business card:

Isaac Abraham, (Ex) Fondé de Pouvoirs de la Société de Crédit Ghirdap, Varna

Isaac Abraham, (Ex) Fondé de Pouvoirs de la Société de Crédit Ghirdap, Varna

Crédit Ghirdap was the first Bulgarian Bank founded in 1881, with branches in Roustchouk, Sofia and Varna. The title "Fondé de Pouvoirs" can be translated as "Legal Representative", or "Authorized Officer".

Isak's name appears (Russified as Isaac Avramoff) in the publication "Zionist Work in Palestine" (1911) (London : Pub. on behalf of the Zionist Central Office by T. F. Unwin). His name is listed as the representative of the Jewish National Fund Agency in Bulgaria:

"The following Collecting Agencies (of the Jewish National Fund ) will supply any further Information and receive Contributions"

"Bulgaria: Isaac Avramoff, Directeur de la Societe de Credit "Ghirdap", Varna"

Isaac Avramoff, Directeur de la Societe de Credit Ghirdap, Varna

Isaac Avramoff, Directeur de la Societe de Credit "Ghirdap", Varna

Isak's name also appears in three issues of "Die Welt", the publication of the Zionist Organisation, listing donations he collected. (10 February 1911, #6, 7 April 1911, #14, July 19 1912, #29).

Isaac Avramoff, Die Welt

Die Welt, 1912: Isaac Avramoff

If, as I assume, "Isak Abraham, Ex Fondé de Pouvoirs de la Societe de Crédit Ghirdap" and "Isaac Avramoff, Directeur de la Societe de Credit Ghirdap, Varna" are one and the same person, these listings provide some interesting information.

First, they indicate that Isak was succesful at a relatively young age - he would have been the head of a branch of a bank when only 28.

They also show that, like his brothers Haim and Moritz, he was involved in Zionist activities - apparently in charge of fund raising for Bulgaria.


There is no information on Isak's whereabouts between 1912 and 1924. A recently found immigration manifest to Argentina dated 1916 raises the intriguing possibility that he might have moved to the New World, at least for a few years.

While researching his younger brother's Mony move to Buenos Aires, I wondered if he had relatives there, and found an entry for someone who very closely matches Isak's identity:

Manifest / Immigration Registry
Last Name First Name Age Civil Status Nationality Place of Birth Occupation Arrival Date Ship Port
Abraham Isaac 33 C Rushtshuk Merchant 1916/11/14 Malte Santos

While this could simply be a coincidence, one has to consider the odds of there being two merchants named Isak/Isaac Abraham, born in 1883 in Rustchuk. According to Wikipedia, there were 1,943 Jews in Rustchuk in 1883.

There are no other documents at this point to confirm that "Isaac" and "Isak" are the same person, but if they are indeed the same person, this might help explain why his brother Mony chose Argentina as his new home in 1925.

On the other hand, Isaac is listed as being married ("C" = Casado = Married) on the manifest. I am not aware of Isak Abraham having ever been married, so this could after all be a different person.


In 1924, Isak sent a photo from Vienna to his brother - whom he called "Moise" - with wishes for the Jewish New Year. It is not known if he resided in Vienna or was travelling.

Isak Abraham - Vienna - 1924

Isak Abraham - Vienna - 1924

This 1928 photo was taken in a photo studio in Bad Ischl, a spa town in Austria.

Isak Abraham

Isak Abraham, September 30, 1928

Bad Ischl, Austria.

Collection of Iris Eldar Nir

A draft of a Power of Attorney drawn in the 1920's to allow an unnamed party to sign a mortgage agreement between Isak ("Abramov") and his maternal grandmother Rebecca Yaakov for her one half of a house in Ruse indicates that Isak lived in Berlin when this document was created.

Power of Attorney for mortgage

Power of Attorney for mortgage, 1920's

"I, Rebecca Isaac Solomon Jakob, from the city of Ruse, now living in Vienna, 11 Prater Straße # 34, floor IV, auhtorize ( no name ) from ( no city name )

- to conclude a mortgage agreement and to mortgage to Isaac I. Avramov from the city of Ruse, now living in the city of Berlin, 1 Tatseninu (?) Street, my half of the house in the city of Ruse, which I have 27 Evreiska Street, and now David Street, plot 69 with neighbors: Merdohai Nesimov, heir to Jewish Street (?) and now David Street.

- to appear before all persons, authorities and institutions and the Notary in the Kingdom of Bulgaria to take out the mortgage and sign all the papers on the case, and this mortgage made for 140,000 BGN equal to 5200 Swiss Francs with 10% annual interest for 3 years from interest will be paid every six months."

(Note that the wording and the exact addresses are not completely clear (Google translate).

Isak Abraham - August 1930

Isak Abraham - August 29, 1930

Collection of Iris Eldar Nir

In January 1931, Isak sent a photo to his brother, whom he now called "Moritz". His address was Kaiser allee 66, Berlin-Friedenau.

Isak Abraham - Berlin - 1931

Isak Abraham - Berlin - 1931

Isak Abraham never married and left no descendants. He died on December 11, 1931, at the age of 48. His occupation was listed as "Kaufmann" (businessman/trader/merchant). His last home was Berlin-Friedenau, Kaiser allee 66 (although in a document dated 1956, his last address was given as Berlin, Wittenbergerplatz (probably Wittenbergplatz), "in a well-known pension".)

Isaak was buried in the Weissensee Jewish Cemetery in Berlin.

Isak Abraham tombstone, age 13, Rustchuk, 1896

Isak Mamo Abraham's tombstone, Weissensee cemetery, Berlin.

Isaak's Will

The beneficiaries of Isaak's will were two of his brothers - Chaim (Haim) and Mony - and his two nephews - my father Uriel, and his brother Gideon (Gisy). Left out from his will was his third brother, my grandfather Moritz. It's not clear why he decided to make this exception, and whether this indicates a possible falling out between Isaak and Moritz.

At the time of his death, Isaak owned or co-owned seven rental properties in Berlin. It's not clear what happened to his estate, however what happened to one of the properties would trigger a lengthy lawsuit initiated by Ronya after the war.

According to documents related to the case, the property was supposedly bought in 1934 by a person also named Isaak Abraham. After his death in 1938, the property was then sold for a fraction of its value due to the Aryanisation laws. According to Ronya, it was difficult to believe in such a bizarre coincidence, and she argued that it had to be a hoax since Jews couldn't buy real estate in 1934 but were instead pressured to sell what they owned at a steep discount. After years of proceedings, the lawsuit ended unsuccessfully in 1957 and Ronya lost the case.

Very Special Thanks:
Antonia Belt, for visiting the Weissenssee cemetery on my behalf and taking photos of Isaak's tombstone.

This family history project started September 2009.
All photos and documents belong to the author and are © Daniel Abraham, except for maps and where indicated.
Please have the courtesy to ask before copying any content.

This is a work in progress. Please contact me if you have any more information to contribute.

Last Modified: Saturday, January 1, 2022