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| Lacken | fairly rare: Mayo etc. Ir. Ó Lacáin, Ó Laicín, according to MacLysaght, but Woulfe gives Ó Lacháin and equates it with Ó Lócháin & Ó Leocháin, an ancient family of Meath, dispersed after the Invasion. Lóch (radiant) was a first name in early times. |
| Lecane | Very rare: Cork. |
Parishes where a Lucken and a second surname married each other.