Where does “dēlen” come from?

dēlen (Old Dutch) comes from Proto-Germanic dailijaną, from Proto-Indo-European dʰAil- — part, watershed.

Ancestry of “dēlen”, step by step

Step	Language	Word	Meaning
1	Proto-Germanic	dailijaną	to divide, to share, to deal
2	Proto-Indo-European	dʰAil-	part, watershed

dēlen — Etymology, Origin & Word History | Etymology Explorer