I know of an Iain Murchie who was at Ardrossan Academy in the 1950s. He would have been born around 1944/5 and played for the Academicals Rugby Team. He stayed with a relative near me but his home was Lamlash, Arran. I recall some family connection to a shop or store at Lamlash. There also was a Murchie's Tearoom on Princes Street, Ardrossan in the 50s and 60s, perhaps connected.
cheers, Ian