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| Millan | rare: Antrim etc. Scottish, synonymous with Millane, q.v. |
| Millane | rare: Clare-Galway etc. Ir. Ó Maoláin. Dimin. of maol, bald, blunt. See Mullane. |
| Millen | fairly numerous: E Ulster. Scottish, synonymous with Millan and Mullane. ASG gives the Irish as Ó Maoilín. |
| Millin | rare: Antrim etc. Ir. Ó Maoilín (SGA); Ó Mealláin (SI). Two different roots: see Millen and Mallon. |
| Ó Maoileáin | Moylan: líonmhar ar fud na tíre, i gCorcaigh ach go h-áirithe. Ní fios carbh as don chlann sa ach is cinnte gur Muimhnigh iad riamh is choíche. MIF. |
Parishes where Millan and a second surname are both baptised.
This list shows total Millan Roman Catholic baptisms by county.
Click on the county to see detail.