Where does “hitter” come from?

Hitter comes from English hit plus the agent suffix -er, derived from Old French -er and Latin -āre (infinitive marker) and -ārius (agent noun suffix), ultimately from Proto-Indo-European *key- (to set in motion).

hitter (English): Agent noun of hit; one who hits; One who comes up...

Definitions

Agent noun of hit; one who hits; One who comes up...

Ancestry of “hitter”, step by step

Step	Language	Word	Meaning
1	English	hit	"To strike."; To manage to touch in the right...
2	Middle English	hit	Third-person singular neuter pronoun: it;...
3	Old English	hit	it
4	Proto-Germanic	hit	nominative/accusative singular neuter of *hiz
5	Proto-Indo-European	ḱe-	demonstrative particle; here; this, here

Every word from Proto-Indo-European ḱe- →Every word from Proto-Germanic hit →Every word from Old English hit →