Where does “alcalde” come from?

alcalde (Old Spanish) comes from Arabic قاض, from Arabic قَضَى — to judge; to perform.

Ancestry of “alcalde”, step by step

Step	Language	Word	Meaning
1	Arabic	قاض	to demolish; judge; fatal, lethal, deadly
2	Arabic	قَضَى	to judge; to perform

alcalde — Etymology, Origin & Word History | Etymology Explorer