his (pron.) Look up his at Dictionary.com
Old English his (genitive of he), from Proto-Germanic *hisa (cognates: Gothic is, German es). Originally also the neuter possessive pronoun, but replaced in that sense c. 1600 by its. In Middle English, hisis was tried for the absolute pronoun (compare her/hers), but it failed to stick. For dialectal his'n, see her.