Here is what Woulfe has to say about GAVAGHAN: a branch of the Ui Fiachrach who were anciently chiefs of Calraighe Muighe hEleog, a district nearly co-extensive with the parish of crossmolina, in Co. Mayo; now very common in Mayo and Sligo. Variants: Gavahan, Gavacan, Gavigan, Gaffikan, Gaughan, Gahan. Ellen