Old Welsh origin
Source-reportedFrom Middle Welsh Ystradwel, from Old Welsh Stradwel, Stradwawl, possibly from Old Welsh strat (“valley”), from Proto-Brythonic *strad, Proto-Celtic *stratos + Old Welsh guaul (“rampart, boundary”), from Proto-Brythonic *gwọl, from Proto-Celtic *wālos (“hedge, enclosure”).
Sources for this account (2)
- Wiktionary: YstradwelCC-BY-SA-4.0 · retrieved 2026-10-15
- Polish Wiktionary: YstradwelCC-BY-SA-4.0 · retrieved 2026-10-14

