Where does “dedo” come from?

dedo (Old Spanish) comes from Latin digitus, from Proto-Indo-European deyḱ- — to point out.

Ancestry of “dedo”, step by step

Step	Language	Word	Meaning
1	Latin	digitus	a finger, toe, digit; a twig
2	Proto-Indo-European	deyḱ-	to point out

dedo — Etymology, Origin & Word History | Etymology Explorer