"Fitz" is an old Norman French variant of the Old French word "fils" (variant spellings filz, fiuz, fiz, etc.), used by the Normans, meaning "son". The Normans themselves were descendants of Vikings, who had settled in Normandy and thoroughly adopted the French language and culture. With the exception of the Gaelic-Irish Fitzpatrick (Mac Giolla Phádraig) surname, all names that begin with Fitz – including FitzGerald (Mac Gearailt), Fitzsimons (Mac Síomóin/Mac an Ridire) and FitzHenry (Mac Anraí) – are descended from the initial Norman settlers. A small number of Irish families of Goidelic origin came to use a Norman form of their original surname—so that Mac Giolla Phádraig became Fitzpatrick—while some assimilated so well that the Irish name was dropped in favor of a new, Hiberno-Norman form. Another common Irish surname of Norman Irish origin is the 'de' habitational prefix, meaning 'of' and originally signifying prestige and land ownership. Examples include de Búrca (Burke), de Brún, de Barra (Barry), de Stac (Stack), de Tiúit, de Faoite (White), de Londras (Landers), de Paor (Power). The Irish surname "Walsh" (in Irish "Breathnach") was routinely given to settlers of Welsh origin, who had come during and after the Norman invasion. The Joyce and Griffin/Griffith (Gruffydd) families are also of Welsh origin.