Where does “-se” come from?

-se (English) comes from Middle English -sen, from Old English -sian, from Proto-West Germanic -isōn, from Proto-Germanic -isōną — Creates denominatives from adjectives or nouns.

Ancestry of “-se”, step by step

StepLanguageWordMeaning
1Middle English-sen
2Old English-sianverbal suffix added to adjectives and nouns,...
3Proto-West Germanic-isōn
4Proto-Germanic-isōnąCreates denominatives from adjectives or nouns
Every word from Proto-Germanic -isōnąEvery word from Proto-West Germanic -isōnEvery word from Old English -sian