Where does “*tonn” come from?

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

Ancestry of “*tonn”, step by step

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

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 →