Donnellan

Donnellan is an Irish surname and refers to the clan name Ó Domhnalláin or O'Donnellan.

More recently, a number of Donnellans had their name changed from Donnelly in the 19th century, located largely in the County Galway/Mayo region.

[1] As such, their descendancy can be traced to the Uí Néill, including the High King Niall of the Nine Hostages.

One of the twelve ancient seats of Connacht, they resided over large areas of Galway, Roscommon and eventually West Meath.

The heads of this family were the chiefs of Clann Bhreasail, the district lying between Loughrea and Ballinasloe.