Where does “besslen” come from?

besslen (Cornish) comes from English Bessel, from Cornish meskel, from Old Cornish mesclen, from Latin mūsculus, from Ancient Greek μῦς, from Proto-Hellenic *mū́s, from Proto-Indo-Iranian múHs, from Proto-Indo-European múh₂s — mouse.

Ancestry of “besslen”, step by step

StepLanguageWordMeaning
1EnglishBessel—
2Cornishmeskelmussels
3Old Cornishmesclen—
4Latinmūsculusa small mouse
5Ancient Greekμῦςmouse; A type of mussel; A type of whale
6Proto-Hellenic*mū́s—
7Proto-Indo-IranianmúHsmouse
8Proto-Indo-Europeanmúh₂smouse
Every word from Proto-Indo-European múh₂s →Every word from Proto-Indo-Iranian múHs →Every word from Proto-Hellenic *mū́s →