Where does “Lostwydhyel” come from?

Lostwydhyel (Cornish) comes from Cornish lost — tail.

Ancestry of “Lostwydhyel”, step by step

Lostwydhyel traces back through two separate lines of ancestry.

via Cornish lost

StepLanguageWordMeaning
1Cornishlosttail

via Cornish Gwydhyel

StepLanguageWordMeaning
1CornishGwydhyel
Every word from Cornish lost