If you want a truly unusual name with authentic roots, this one certainly fits on both counts. Pronunciation may prove a stumbling block, however.

Gentle meaning and bona fide Hebrew history, but feels old-mannish, like Herman and Menashe.

Well used in Russia, this is a distinctive and undiscovered choice here. Rodion Romanovich Raskolnikov is the fictional protagonist of Crime and Punishment by Feodor Dostoyevsky.

A surname style choice that could get you nicknames Bear and Ozzy, which is pretty cool. It comes from the Old English variant of the Old Norse Ásbjǫrn, which was introduced to England after the Norman conquest and used occasionally as a given name ever since. Victorian author Elizabeth Gaskell used the spelling variation Osborne in her final novel, Wives and Daughters.

Common surname rarely used as a first.