Named after Merok Burn, a partially culverted tributary of the Cregagh River which flows through this estate. Merok Burn forms the boundary between the townland of Cregagh on the west bank and Castlereagh / Lisnasharragh on the east bank. Gordon McCoy suggests that this name may be derived either from Ulster Scots mairk, 'land worth a mark' or 'boundary marker', or alternatively from Irish méaróg meaning 'standing stone' (A Gaelic History of East Belfast, back cover map).