Where does “Llychlynwyr” come from?

Llychlynwyr (Welsh) comes from Welsh ŵyr, from Middle Welsh wyr — Soft mutation of gwyr.

Ancestry of “Llychlynwyr”, step by step

Llychlynwyr traces back through two separate lines of ancestry.

via Welsh ŵyr

StepLanguageWordMeaning
1WelshŵyrSoft mutation of gŵyr; grandson, grandchild
2Middle WelshwyrSoft mutation of gwyr

via Welsh Llychlyn

StepLanguageWordMeaning
1WelshLlychlyn—
2Middle IrishLochlann—
Every word from Middle Welsh wyr →Every word from Welsh ŵyr →