A surname of Irish origin, or can refer to vertical structural posts between windows or doors. As a proper noun, it's commonly used as a family name.
From Irish Ó Maoláin, meaning 'descendant of Maolán,' where Maolán is a diminutive of 'maol' meaning bald or tonsured. The architectural meaning comes from French 'moineau' meaning small monk, referring to the vertical dividers.
The connection between 'mullins' as a surname and window mullions is purely coincidental - one comes from Irish 'bald' and the other from French 'monk.' Many Irish surnames beginning with 'Mul-' relate to religious or monastic terms.
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