Where does “Aina” come from?

Aina (Norwegian) comes from Finnish Aina, from Finnish Aino, from Finnish ainoa, from Proto-Germanic ainagaz, from Proto-Germanic ainaz, from Proto-Indo-European óynos — one; single.

Ancestry of “Aina”, step by step

Step	Language	Word	Meaning
1	Finnish	Aina	always
2	Finnish	Aino	A heroine in the Kalevala
3	Finnish	ainoa	only, sole; only
4	Proto-Germanic	ainagaz	only; sole; singular; unique
5	Proto-Germanic	ainaz	one; some
6	Proto-Indo-European	óynos	one; single

Every word from Proto-Indo-European óynos →Every word from Proto-Germanic ainaz →Every word from Proto-Germanic ainagaz →