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
Castletown, Dorset is found in the village, close to the entrance of Portland Port. The area still features several hotels and pubs, largely established for the navy personnel that once came from the port. The Osprey Leisure Centre is located in Castletown, which was formerly known as the Boscawen Centre, and was opened to the public in May 2007. Originally it was a private Royal Navy facility during the 1980s. Castletown also holds the Portland Community Hospital. This was originally a Royal Naval Hospital which served Portland's naval base from the late 19th century until 1957, when the hospital was handed over