Just came across the name "Gisha" as a Hebrew name. Although I'm skeptical about these equivalences, her English name was Hilda. I don't know her country of origin, but I have the additional clue that her son's middle name is Gersh rather than Hersh, but I haven't heard of Hisha as a name either. Anyone out there with a clue?
Lanie Bergman
Dear Lanie.
"My logic" says: Gisha / Hisha, nicknames for Gilda / Hilda. I don't know of such Hebrew name, but I suppose that if it's not nickname than it might be in Yiddish (but that is for another fellow to answer).