Globally, Diarmait (Diarmait 
) is a very rare male first name. The first name Diarmait is characteristic of Northern Europe, particularly Ireland, where it is a rare male name.
| diarmait ua briain King of Munster, IE (b. 1060) |
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| diarmait mac giolla chriost Irish academic (b. 1965) |
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| diarmait mac tommaltaig King of Connaught |
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| diarmait mac cerbaill High King of Ireland |
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| diarmait mac áedo sláine 7th-century Irish monarch |
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| diarmait mac cerbaill King of Osraige |
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| diarmait o cobhthaigh Irish poet |
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| diarmait dian 7th-century Irish monarch |
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| diarmait mac cormaic 1098 - 1185 (slain) |
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| diarmait ua diummusaig Irish king of Uí Failge, IE |
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| diarmait mac maíl na mbó king of Leinster, King of Ireland with opposition, IE |
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| diarmait mac conaing Kings of Brega |
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| diarmait dúna droignéin mac domnaill -1229 |
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| diarmait ua tigernáin bishop of Armagh (d. 852) |
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| diarmait of iona 9th-century Christian clergyman |
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Surmon, Mcclean, O'Reilly, and Mac Con Uladh