Where does “æn” come from?

æn (Old Swedish) comes from Old Norse einn, from Proto-Germanic ainaz, from Proto-Indo-European óynos — one; single.

Ancestry of “æn”, step by step

StepLanguageWordMeaning
1Old Norseeinnone; some, a few
2Proto-Germanicainazone; some
3Proto-Indo-Europeanóynosone; single
Every word from Proto-Indo-European óynos →Every word from Proto-Germanic ainaz →Every word from Old Norse einn →