banshee

Banshee entered English in 1771, borrowed from Irish bean sí, which traces back to Old Irish ben síde, literally 'woman of the fairy mound.'

The facts here don't describe a shift in meaning — the word seems to have carried its 'fairy woman' sense with it when it entered English in the 18th century.

The Irish word síde, 'of the fairy mound,' points back to the same Old Irish root as bean sí — but no English cognate is given in the facts available.