Around the globe, Calwin (Calwin 
) is a very rare boy's given name. The forename Calwin is characteristic of South Africa, where it is a very rare masculine name, and India, where it is an extremely rare boy's name. Much less frequently, Calwin is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Calwin | South Africa, Malaysia, Singapore, United States, India |
Ly, Alegre, Ashton, Caster, Dsouza, Joseph, Tracey, Fabria, French, Moseley, Clement, Likiaksa, Thoguru, Millarez, Campbell, Tumutong, Emmanuel, Bocanegra, Devanesan, Gusrianto, Shantharaj, Foo Yong Sheng, Mathew, Parthibaraj, Titus, Primo, Ng, Ang, Koo, Lee, Lim, Loh, Tan, Foo, Chan, Chun, Bull, Kirk, Paul, Rose, Tang, Yong, Moses, Muthu, Souza, Swami, Cairo, James, and Ramonyadiwa