Where does “llaethdai” come from?

llaethdai (Welsh) comes from Welsh tai, from English thai, from Thai ไทย, from Pali deyya, from Hindi देय, from Sanskrit देय॑.

Ancestry of “llaethdai”, step by step

llaethdai traces back through two separate lines of ancestry.

via Welsh tai

StepLanguageWordMeaning
1Welshtaiplural of tŷ; third-person singular conditional...
2EnglishthaiOf or pertaining to Thailand
3Thaiไทยperson; human being; Siamese person; Thai person
4Palideyyato be given
5Hindiदेयgiven
6Sanskritदेय॑

via Welsh llaeth

StepLanguageWordMeaning
1Welshllaethmilk; milk-like substance, latex; milt, soft roe
2Proto-Brythonicllaɨθmilk
3Latinlactisgenitive singular of lac; of milk; milk
4Latinlácmilk
5Proto-Indo-Europeanǵláktsmilk
Every word from Sanskrit देय॑Every word from Hindi देयEvery word from Pali deyya