I am from northeastern North Dakota; I was not aware of any Hyldens in the UK. From what I understand from my grandmother, Hylden is a misspelling of an older Norwegian name, Hidla, I believe. It has always been my grandmother's contention that all Hyldens are related because they all branched from one misspelling at the immigration office, but if you know of British Hyldens, that must not be true, since all Hyldens I am related to in the North Dakota area are Norwegian.