Captain David Rabin painted the Hebrew words Shalom ("peace") and L'chaim ("to life") on the exterior walls of the Starfleet mission to planet Obsidian, following the local custom of using tribal marks in this way. (TOS novel: Vulcan's Forge)
A modern variant of Hebrew, Yiddish, was commonly spoken by Jews of European and North American descent, and numerous Yiddish words worked their way into the English language. Sergei and Helena Rozhenko were fluent in Yiddish. (TNG - Starfleet Academy novel: Worf's First Adventure) Captain David Gold often peppered his speech with Yiddish terms. (SCE eBook: The Belly of the Beast, et. al.)
- Real life Star Trek actors known to speak Yiddish are Whoopi Goldberg (Guinan), Saul Rubinek (Kivas Fajo), William Shatner (James T. Kirk) and Leonard Nimoy (Spock).