I know for a fact that people in Wales are called Welsh.
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"Welsh" can refer to people or things related to Wales, a country in the United Kingdom. It can also refer to the Welsh language, which is spoken by some people in Wales.
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Scottish people live in Scotland. Welsh people live in
Wales.
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The Welsh people Cymry; the language is Cymraeg; the adj. is
Cymreig.
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The Welsh language emerged in the 6th century and is still in
use.