Where does “æ” come from?

æ (Jutish) comes from Old Norse ek, from Proto-Norse ᛖᚲ, from Proto-Germanic *ek, from Proto-Indo-European éǵh₂ — I.

Ancestry of “æ”, step by step

StepLanguageWordMeaning
1Old NorseekI
2Proto-NorseᛖᚲI
3Proto-Germanic*ek—
4Proto-Indo-Europeanéǵh₂I
Every word from Proto-Indo-European éǵh₂ →Every word from Proto-Germanic *ek →Every word from Proto-Norse ᛖᚲ →