Namesakes
Diarmait mac Cerbaill
(m) ?-c. 565 
Irish Kings 545-565
Diarmait mac Áeda Sláine
(m) ?-c. 665
Irish Kings 658-665
Diarmaid
(a.k.a. Diarmait) (m) ?-851
Saints
Diarmait mac Máel na mBó
(m) ?-1072
Irish Kings 1042-1072