1. French: from the personal name Guille, a short form of Guillaume (William). 2. Perhaps a reduced form of the Irish family name McGuill, an Anglicized form of Gaelic Mac Cuill 'son of Coll'.

It is debatable whether the word 'Clan' should be used in relation to Irish families, and it is perhaps better restricted to Scots. However, there is an Irish family Ó Cuill (English, Quill) ***************************************************************** Ó Cuill is a Kerry family which was located in the barony of Dunkerron South (Iveragh peninsula) during the 14th-17th centuries. Muintir Uí Chuill would be the usual to say "the O'Quills" but you can use "clann" with Mac- surnames such as Clann Mhic Ruairí (the McRorys). "Clann" literally means "children" and is used in that sense also.

Mac Pro is better than Mac Genius. Mac Pro is a faster computer than Mac Genius. It has old Mac based proceesors but it is faster.

Mac Cairthinn mac Coelboth died in 446.

Mac Beathaidh mac Ainmire died in 1041.