Where does “-dera” come from?

-dera (Swedish) comes from Old Swedish þēra, from Old Norse þeirra.

Ancestry of “-dera”, step by step

StepLanguageWordMeaning
1Old Swedishþēra—
2Old Norseþeirra—
Every word from Old Norse þeirra →Every word from Old Swedish þēra →
-dera — Etymology, Origin & Word History | Etymology Explorer