Where does “-ich” come from?

-ich (Old Frisian) comes from Proto-Germanic -īgaz, from Proto-Indo-European -ḱos — -y, -ic.

Ancestry of “-ich”, step by step

StepLanguageWordMeaning
1Proto-Germanic-īgazforms adjectives from nouns; -y, -ic
2Proto-Indo-European-ḱos-y, -ic

Words derived from “-ich”

Every word from Proto-Indo-European -ḱos →Every word from Proto-Germanic -īgaz →