Surname Smirth (Smirth 
) , around the world, is a very rare family name. The family name Smirth is habitual in Myanmar, where it is a very rare surname, Nigeria, and the United Kingdom, where it is an extremely rare surname. Measured by absolute frequency, it is commonest in Myanmar, Nigeria, and the United States. Very seldom, Smirth is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Smirth | Myanmar, United Kingdom, India, United States, Nigeria |