Where does “martes” come from?

martes (Old Spanish) comes from Latin Martis dīēs, from Latin Mārs, from Proto-Indo-European -ḱos — -y, -ic.

Ancestry of “martes”, step by step

StepLanguageWordMeaning
1LatinMartis dīēs—
2LatinMārsMars god of war
3Proto-Indo-European-ḱos-y, -ic

Words derived from “martes”

Every word from Proto-Indo-European -ḱos →Every word from Latin Mārs →Every word from Latin Martis dīēs →