Where does “টেম্‌স” come from?

টেম্‌স (Bengali) comes from English Thames, from Middle English temse, from Old English Temes, from Latin Tamesis, from Proto-Brythonic *Tamesis.

Ancestry of “টেম্‌স”, step by step

StepLanguageWordMeaning
1EnglishThamesto the Thames Estuary and North Sea
2Middle Englishtemsea sieve
3Old EnglishTemesthe River Thames
4LatinTamesisthe Thames a river in Britain that runs through London
5Proto-Brythonic*Tamesis—
Every word from Proto-Brythonic *Tamesis →Every word from Latin Tamesis →Every word from Old English Temes →