fairly rare: Dublin, Cork etc. English, "physician". See Leech. DOS.
numerous: mainly Leinster with Ulster & Connacht. While this is an old English name meaning physician, it is also an anglicisation of Ó Laoghóg, laogh = calf, in western districts. See also Logue. MIF & SGG.
fairly rare: E Ulster. Scottish version of old English Leech (physician). also Leitch.
Logue, Leech: líonmhar: giorrú ar Ó Maolmhaodhóg in Ultaibh ach tá an bun-shloinne mar Leech i nGaillimh mar a bhfuil siad annamh. I gCill Conaill, Gaillimh, a bhí an chlann sa bunaithe ar dtús. In oirthear na tíre, is sloinne gallda Leech a chiallaíonn lia, dochtúir.