Where does “rim” come from?

rim (Proto-Germanic) comes from Proto-Germanic rīmą, from Proto-Indo-European h₂rey-, from Proto-Indo-European h₂er- — to fit, to fix, to put together.

Ancestry of “rim”, step by step

StepLanguageWordMeaning
1Proto-Germanicrīmącalculation, number
2Proto-Indo-Europeanh₂rey-to count, count out; to arrange
3Proto-Indo-Europeanh₂er-to fit, to fix, to put together
Every word from Proto-Indo-European h₂er- →Every word from Proto-Indo-European h₂rey- →Every word from Proto-Germanic rīmą →