Where does “ひとみ” come from?

ひとみ (Japanese) comes from Japanese 人, from Proto-Japonic *pitə — one.

Ancestry of “ひとみ”, step by step

ひとみ traces back through two separate lines of ancestry.

via Japanese 人

StepLanguageWordMeaning
1Japanese人a person, human; an individual; mankind, people
2Proto-Japonic*pitəone

via Japanese 見

StepLanguageWordMeaning
1Japanese見seeing, looking; the look or appearance of...
2Middle Chinese見—
Every word from Proto-Japonic *pitə →Every word from Japanese 人 →