SheilaghSheilagh is a feminine given name, derived from the Irish name Síle, which is believed to be a Gaelic form of the Latin name Caelia, the feminine form of the Roman clan name Caelius, meaning 'heavenly'.People with the given name Sheilagh Brown, British fashion designer Sheilagh Kesting, Scottish minister Sheilagh O'Leary, Canadian politician Sheilagh Ogilvie, Canadian historian, economist and academic Sheilagh Polk