Where does “si-edn” come from?

si-edn (Welsh) comes from Welsh edn, from Proto-Brythonic edn, from Proto-Celtic ɸetnos, from Proto-Indo-European péth₂r̥, from Proto-Indo-European peth₂- — to spread out; to fly.

Ancestry of “si-edn”, step by step

si-edn traces back through two separate lines of ancestry.

via Welsh edn

StepLanguageWordMeaning
1Welshednbird
2Proto-Brythonicednbird
3Proto-Celticɸetnosbird
4Proto-Indo-Europeanpéth₂r̥wing; feather
5Proto-Indo-Europeanpeth₂-to spread out; to fly

via Welsh si

StepLanguageWordMeaning
1Welshsimurmur, hum; rumour
Every word from Proto-Indo-European peth₂- →Every word from Proto-Indo-European péth₂r̥ →Every word from Proto-Celtic ɸetnos →