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Batley moved from London to Kidwelly, Carmarthenshire, where the cult operated in a cul-de-sac, Clos yr Onnen.

But Joseff Gnagbo, national chair of Welsh language campaign group Cymdeithas yr Iaith, welcomed the naming policy as setting "an important precedent for the names of constituencies in the future and for using Welsh-only names in other contexts as well".

He had moved from London to the small town of Kidwelly, in Carmarthenshire, where the cult operated in a cul-de-sac, Clos yr Onnen.

Wallis George, of Welsh language campaign group Cwmdeithas Yr Iaith, said a tourism tax was "long overdue," and rejected suggestions it would deter visitors.

But many Welsh speakers would point out that the names haven't changed at all - Eryri and Yr Wyddfa are the names they have used all along.