Spelman, ó Spealáin A Gaelic surname derived from speal meaning ‘a sythe’. A sept of the Ui Fiachrach who were formerly seated in Coillin Aodha (now Culleen), in the parish of Kilglas in Sligo. In 1890 Spelman was principally found in Galway, Roscommon and Mayo, and the estimated number of bearers was 1,340.