I'm in the midst of reading the Israeli writer Meir Shalev's memoir,
entitled "My Russian Grandmother and Her American Vacuum Cleaner: a
family memoir." (Called Ha'davar Hayah Kakha" in its original Hebrew.)
Shalev's grandfather Aharon Ben-Barak disdained two choices his
brother Yeshayahu made: to emigrate to America (>from their town of
Makarov in Ukraine) and to change his first name to Sam. Aharon chose
to emigrate to Palestine where he most assuredly shed the family name
used in the Ukraine and took on the name Ben-Barak. So you end up with
a potential difficulty familiar to a lot of us: two brothers with two
different last names. The brother who went to America "invented" for
himself a new first name and used probably an approximation of the
family name used in Ukraine. The brother who went to Palestine used
his original first name and "invented" a new last name.

Toby Bird
researching: FRUTKO, FRUTKOFF, FROOTKO, MARMOR, KAPLAN, FREEDMAN, FRIEDMAN