numerous: all areas except Ulster, mainly Kerry-Clare-W Limerick-Cork. The Irish is (1) Ó Leannacháin (2) Ó Luingeacháin. The former relates to a Roscommon sept; the latter to Munster and comes, according to Woulfe, from earlier Mac Longacháin where longach may be gluttonous, avid. Note the variants. IF & SGG.
Variants and total numbers.
Click to see county numbers.