What is the Latin word for hey!?

The usual Latin words for “hey!” are euge, iō, heu; also ehem, hui, hem. The right choice depends on the sense; see the distinctions below.

English → Latin

“hey!” in Latin

eugehurrah!, well done!iōan exclamation of joy: hurray, hurrah, yay; an exclamation of pain: oh, ah, alas; an exclamation for getting attention: heuoh! alas! ah!, ay! (expressing dismay, grief, pain, indignation)ehemha! so! (expressing surprise)huiho!, my word! (expressing surprise); ooh!, aah! (expressing admiration)hemeh?, really?, well, well!, just look! (expressing surprise)ēiăah! ah ha! indeed!

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

hey!

as an interjection: (a) of joy, euge! io! (comedy, as are nearly all that follow): hey! that is fine! euge strenue! (b) of astonishment, heu! ehem! hui! at at: hey! what is this, pray? hem! quid hoc est? hey! is it that? at at, hoc illud est? (c) of rebuke or threatening, eia: hey! that would not be fitting, eia, haud sic decet.

Quick answer

What is the Latin word for hey!?: The usual Latin words for “hey!” are euge, iō, heu; also ehem, hui, hem. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.