It would be spelled iod-heh-shin-ayin—which, in Paleo Hebrew (or the script of any Canaanite language of that period) would look somewhat like this (from right to left):
(in those days, the custom was not to use the letter vav as a quasi /o/ or /u/ vowel)
In Square Hebrew (i.e., the script adapted from the Aramaic in the Second Temple period and still in use today), those same letters look quite different, of course:
י ה ש ע
