Latin word ille comes from Old Latin olle

Detailed word origin of ille

Dictionary entry	Language	Definition
olle	Old Latin (itc-ola)
ille	Latin (lat)	That, those, used to refer to (a) person(s) or thing(s) not close to the speaker, in contrast to hic, meaning this. "That (renowned person)" (used to cast the referent in a positive light).. "That" (referring to a person or thing away from both speaker and listener); he, she, it (Medieval Latin, Vulgar Latin) The; used as a definite article.

Words with the same origin as ille