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| Gavan | rare: scattered. See Gavin. |
| Gavin | numerous: S Leinster, N Munster, Mayo. Ir. Ó Gábháin, Ó Gáibhín. There were septs in W Cork and Mayo. They are now in all provinces. This name is both first name and surname in Scotland.MIF & SGG. |
| MacGavin | Very rare: Dublin. Ir. Mac Gábháin, possibly gábhadh, want, need. See also Gavin. The name is in Scotland where it matches MacGowan, q.v. |
Parishes where McGavin and a second surname are both baptised.