Where does “tonn” come from?

tonn (Middle Welsh) comes from Proto-Brythonic *tonn, from Proto-Celtic tundā, from Proto-Indo-European (s)tewd-, from Proto-Indo-European stew- — to praise, laud.

Ancestry of “tonn”, step by step

tonn traces back through two separate lines of ancestry.

via Proto-Brythonic *tonn

StepLanguageWordMeaning
1Proto-Brythonic*tonn—
2Proto-Celtictundāwave, billow
3Proto-Indo-European(s)tewd-to push, to hit
4Proto-Indo-Europeanstew-to praise, laud

via Proto-Celtic tondā

StepLanguageWordMeaning
1Proto-Celtictondāskin; surface, skin
2Proto-Indo-Europeantend-to stretch, to extend; to split, cut off
3Proto-Indo-Europeantemh₂-to stretch, string; to cut

Words derived from “tonn”

Every word from Proto-Indo-European stew- →Every word from Proto-Indo-European (s)tewd- →Every word from Proto-Celtic tundā →
tonn — Etymology, Origin & Word History | Etymology Explorer