Cymru is the Welsh name for Wales — the country on the west of the island of Great Britain, next to England. Welsh people say Cymru in their own language; English speakers usually say Wales. You will see Cymru on football and rugby shirts, on road signs, and in the proud line Cymru am byth (“Wales for ever”). It is the country’s real name in Welsh, not a cute English nickname. Though actually, English has older cousin-names from the same Celtic root: Cambria (a poetic or Latin-style name for Wales), and Cumbria and Cumberland (places in the north of England). Those are not extra countries; they are related words that drifted to different spots on the map. In English, treat Cymru as a proper name.