Where does “Aslak” come from?

Aslak (Finnish) comes from Norwegian Aslak, from Finnish Ásllat, from Old Norse Áslákr.

Ancestry of “Aslak”, step by step

Step	Language	Word	Meaning
1	Norwegian	Aslak	—
2	Finnish	Ásllat	—
3	Old Norse	Áslákr	—