Where does “Nelli” come from?

Nelli (Finnish) comes from Asturian en, from Latin în, from Latin en, from Proto-Italic en, from Proto-Indo-European h₁én — in.

Ancestry of “Nelli”, step by step

Nelli traces back through two separate lines of ancestry.

via Asturian en

StepLanguageWordMeaning
1Asturianenin
2Latinînin, at, on, upon, from (space)
3Latinenlookǃ beholdǃ; reallyǃ?; come onǃ
4Proto-Italicenin
5Proto-Indo-Europeanh₁énin

via English nelly

StepLanguageWordMeaning
1EnglishnellyA person's life; An effeminate homosexual man; A...
2EnglishNelly Duff
Every word from Proto-Indo-European h₁énEvery word from Proto-Italic enEvery word from Latin en