Updated June 9, 2019 Find Baby Names Family name origins & meanings Irish : probably a reduced Anglicized form of Gaelic Ó Gáibhtheacháin (see Gavaghan).Irish : (Ulster) reduced Anglicized form of Gaelic Mag Eachagáin ‘son of Eachagán’, a diminutive of the personal name Eachaidh, from each ‘horse’. Compare Gahan 1.