Marmaduke
[ˈmɑːrməˌdjuːk]Meaning
possibly from Old Irish Máel Máedóc, "devotee of Maedóc"
Background Story
Marmaduke is possibly derived from the Old Irish name Máel Máedóc, meaning "devotee of Maedóc", an Irish saint. The name is also anglicised as Malachy, and has been traditionally used in the Yorkshire area of Britain.

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