McDermott or MacDermott is an Irish surname and the anglicised version of Mac Diarmada (also spelled Mac Diarmata), the surname of the ruling dynasty of Moylurg, a kingdom that existed in Connacht from the 10th to 16th centuries.

The last ruling king was Tadhg mac Diarmata, who ruled until 1585.

As a modern day surname, McDermott is mostly found in western Ireland and County Roscommon.

Some notable people with the surname are listed below.

Surname

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