There were four Gettys listed in the 1843 Belfast Directory.
GETTY
Edmund, Ballast Master, Ballast Office.
Residence 2 Victoria Place.
Miss, 40 Donegall Street.
Mrs, Falls Road.
Samuel G.,Esq., Whiteabbey.
Getty is a Derry and Antrim name, possibly a shortened form of Dalgetty (Scottish).