Welsh and British
Jimmy Wales was born in Huntsville, Alabama, and is American.
Australian, but born in wales
British. Born in London raised in Wales
Welsh
Lenka was born in New South Wales In Australia, making her Australian.
The Nationality of Man United's Tom Jones is Wales.
Ben Hall was a bushranger in Australia. He was born in New South Wales in 1837.
That would be a personal choice as you could use either as your nationality. A Welsh nationalist is likely to choose Welsh while a non Welsh speaker who is a supporter of the United Kingdom might choose British.
The Nationality of Man United's Ray Bennion is Wales.
The Nationality of Man United's Harry Thomas is Wales.
The Nationality of Man United's Tommy Bamford is Wales.
The Nationality of Man United's Mark Hughes is Wales.