| Antrim: | 60 | Armagh: | 14 | Belfast city: | 7 | Cavan: | 1 |
| Clare: | 1 | Cork: | 1 | Cork city: | 1 | Derry: | 10 |
| Donegal: | 4 | Down: | 15 | Fermanagh: | 7 | Meath: | 1 |
| Monaghan: | 6 | Offaly: | 1 | Tyrone: | 19 | Waterford: | 1 |
| Wicklow: | 1 |
| Glas | Glass: líonmhar: Ulaidh. Seo sampla de bhua-aidiacht a tháinig in áit an t-sloinne bhunaidh. Is cosúil gur Albanaigh cuid mhaith díobh in Ultaibh. B'ainm pearsanta é, Glas, chomh maith. |
| Glass | numerous: Ulster generally. Ir. Glas (grey or green). There is also a Scottish name of the same derivation, which must account many in Ulster. SI & SS. |
Parishes where Glass and a second surname are found together
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