Ἰουδαίων [3 verses](noun pl masc gen) "Jews" is from Ioudaios, which means "Jew." - "Jews" is from a Greek word meaning Jew. It is also the future particple of a verb meaning "to side with."

Ἰσαὰκ [5 verses] (Hebrew name) "Isaac" is from Isaak.- "Isaac" is from the Greek spelling of the patriarch's name.

ἰσάγγελοι [1 verse]( adj pl masc nom) "Equal unto angels" is isaggelos, which means "like an angel." It is an invented word from isos-, which means "equal" in size, strength, number, or rights and -aggelos, which means "messenger" and "envoys."  This word is found nowhere else in ancient Greek, used only to describe people awakened from death. It is just a coincidence that it resembles "is angels" in English. If you believe in coincidences.

ἰσχυρόν;  [2 verses](adj sg masc acc) "The strong man" is ischuros, which means, as an adjective, "strong," "mighty," and "powerful," "forcible," "violent," "severe," "excessive," and, as an adverb, "strongly, with all force, very much, exceedingly, from ischus, meaning "strength."  - "A strong man's" is from an adjective used as a possessive noun. It means "strong," "mighty," and "violent." So it means "of a strong one" or "of a violent one."

ἰσχύος  [4 verses]( noun sg fem gen) "Strength" is ischys, which means "strength of body", "might", "power", "brute force," and "motive force." -- "Mighty" is an adjective that means "strong", "mighty," and "violent." So it means "a strong one" or "the violent one."