Globally, Billow (Billow 
, Bylgja 
) is a rare epicene first name. The forename Billow is habitual in Iceland, where it is quite a common girly name, and India, where it is an extremely rare unisex name. More prevalently, Billow is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Billow | India, Sweden, United States, China, Kenya |
| Bylgja | Iceland, United States, United Kingdom |
| brennan s billow researcher |
|