OpenStreetMap can be queried with a regex, so here's places in Wales where the Welsh name is only the top row: https://overpass-turbo.eu/?w=(name:cy~/^[qwertyui

OpenStreetMap can be queried with a regex, so here's places in Wales where the Welsh name is only the top row: https://overpass-turbo.eu/?w=(name:cy~/^[qwertyuiop]*$/i)%20in%20wales https://overpass-turbo.eu/?w=(name:cy~/^[qwertyuiop]*$/i)%20... There's four: a hamlet named Treopert, a mountain range in Snowdonia named Eryri, a house in Bangor University named after that mountain range, and TUI outdoor shop. Curiously the longest top-row places I can find anywhere on OpenStreetMap are almost all roads in France: Rue Pierre Ropert Rue Pierre Riquet (x2) Rue Pierre Poutot Rue Pierre Potier (x4) Rue Pierre Perret (x3) Rue Pierre Pietri Route Petit Peyre (x2) Poirier Pierrotte Petite Rue Pierre Rue Pierre Perrier (x3) Rue Pierre Pottier (x3) Rue Pierre Routier Rue Poirier Piquet Rue Pouyer Quertier (x2) Route Pourpre et Or Tyrepower Port Pirie <-- a shop in Australia Petite Route Petite Rue