Latin word decanus comes from Latin decem ((cardinal) ten; 10.), Latin -anus

Detailed word origin of decanus

Dictionary entry	Language	Definition
decem	Latin (lat)	(cardinal) ten; 10.
-anus	Latin (lat)	Of or pertaining to; -ian; usually indicates a relationship of position, possession, or origin.
decanus	Latin (lat)	Chief of ten people (in various contexts). Dean.

Words with the same origin as decanus