Colby, Isle of Man Colby, Isle of Man Colby () is a small village in the south of the Isle of Man in the parish of Arbory. It lies on the A7 road between the towns of Castletown and Port Erin and close to the similarly sized village of Ballabeg. The name Colby is of Scandinavian origin and is derived from Kolli's Farm which was home to the lexicographer, Archibald Cregeen (1774–1841). The word Colby is thought to derive from the Viking words Col (meaning Hill) and Byr (meaning farm). The village has a railway station on the Isle of Man Steam Railway and
Port St Mary Railway between Douglas and Port Erin. Steam trains operate on the line several times a day during the summer season, and stop at Port St Mary. The village is served by Bus Vannin services to Port Erin, Castletown, Douglas and Onchan. Once a fishing and trading port, the village is still popular with tourists and fishermen, especially during the summer. The inner harbour, with its pier created in 1812, is tidal and dries out from half-tide. The outer harbour, created when the Alfred Pier was built in 1882, is accessible at all tide states - unique amongst the Manx ports.