Bagarat

Also Bagarad, Bogorad, Bogoradovsky.
Derived from the acronym "Ben Rabbi Dovid" ( a son of Rabbi Dovid).

Bekker

Yiddish for baker, also Vecker, Vekker, Beker.

Rumberg

From the German town of Bromberg.

also Romberg, Bromberg, Brombarg, Bronberg, Rumba(c)k, Brumbarg, Brumberg.

Bless

from the German "Blaesse", "pale-faced".