The boy's name Colwin\c(o)-lwin, col-win\ is a variant of Colwyn (Welsh). See for meaning of Colwin.
The baby name Colwin sounds like Colin and Collin. Other similar baby names are Coldin and Corwin.
Colwin is a very rare male first name and is not used as a surname (source: 1990 U.S. Census). Displayed below is the baby name popularity trend for the boy's name Colwin. Compare Colwin with related baby names.