Where does “miga” come from?

miga (Old Spanish) comes from Latin mīca, from Proto-Italic smīkā, from Proto-Indo-European smēyg-, from Proto-Indo-European smē- — to rub; smear.

Ancestry of “miga”, step by step

Step	Language	Word	Meaning
1	Latin	mīca	—
2	Proto-Italic	smīkā	—
3	Proto-Indo-European	smēyg-	small, delicate, thin; twig, pole; crumb; small,...
4	Proto-Indo-European	smē-	to rub; smear

miga — Etymology, Origin & Word History | Etymology Explorer