Ó Seibhleáin
Ó SEIBHLEÁIN, Ó SEIBHLÍN—I—O Syvelane, O Shevline, Shevlin, Shovlin, Shovelin; 'descendant of Sibhlian' (quick); older Ó Sibhlen, Ó Sibhliain; the name of a family who were anciently lords of Ui Failghe, or Offaly; also of a branch of the Ui Eachach Muaidhe in Co. Mayo; now found chiefly in Ulster.
Alphabetical Index to Irish Surnames