Where does “loncwyr” come from?

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

Ancestry of “loncwyr”, step by step

loncwyr 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 loncian

StepLanguageWordMeaning
1Welshloncianto jog
Every word from Middle Welsh wyr →Every word from Welsh ŵyr →