Where does “Æ” come from?

Æ (Icelandic) comes from Old Norse æ, from Proto-Germanic aiwį̄, from Proto-Germanic aiwaz, from Proto-Indo-European h₂eyu-, from Proto-Indo-European h₂ey- — vital force, life, age, eternity; day, morning.

Æ (Icelandic): ah!, oh!

Definitions

ah!, oh!

Ancestry of “Æ”, step by step

Step	Language	Word	Meaning
1	Old Norse	æ	ever, at any time; inflection of æja: ##...
2	Proto-Germanic	aiwį̄	—
3	Proto-Germanic	aiwaz	long time, age, eternity
4	Proto-Indo-European	h₂eyu-	vitality; eternal; vital force, life, long life,...
5	Proto-Indo-European	h₂ey-	vital force, life, age, eternity; day, morning

Every word from Proto-Indo-European h₂ey- →Every word from Proto-Indo-European h₂eyu- →Every word from Proto-Germanic aiwaz →