Family name Joihn (Joihn 
) , across the world, is a very rare surname. The surname Joihn is habitual in Myanmar, where it is a very rare surname, Nigeria, where it is an extremely rare surname, and the United Kingdom. Likewise, Joihn is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Joihn | Australia, Myanmar, United Kingdom, United States, Nigeria |