From Old English 'sele' (hall) and 'wine' (friend), or Welsh meaning blessed friend.
Selwyn is an Anglo-Saxon name of distinguished obscurity, most likely a compound of the Old English elements *sele* (hall, manor house) and *wine* (friend), yielding the appealing meaning "friend of the hall" — a name implying hospitality and social grace. Some etymologists suggest an alternative derivation from the Welsh *sêl* (zeal) and *gwyn* (white, blessed), which would give it a more spiritual resonance and reflects the long contact between English and Welsh naming traditions along the border counties. The name's most enduring institutional legacy is Selwyn College, Cambridge, founded in 1879 in memory of George Augustus Selwyn, the first Bishop of New Zealand and later Bishop of Lichfield.
Selwyn was a figure of enormous energy — he reportedly swam ashore to greet Maori communities rather than waiting for a boat — and his reputation for rugged evangelism gave the name a muscular Victorian respectability. Selwyn Lloyd, who served as both Foreign Secretary and Chancellor of the Exchequer under Harold Macmillan, kept the name in public consciousness through the mid-twentieth century. In the broader culture Selwyn has always been a rarity — never fashionable, never entirely absent.
It carries the particular charm of names that were never common enough to feel tired: bookish, slightly formal, and possessing a quiet originality. It has seen modest renewed interest as parents search for genuinely uncommon English names with historical depth.