Surname واسو (Waso 
, Waswo 
, واسو 
) , around the globe, is quite a rare cognomen. The surname واسو is habitual in Mongolia, where it is quite a rare surname, New Zealand, where it is a rare surname, and Saudi Arabia. Measured by absolute frequency, it is the most numerous in Pakistan, Indonesia, and Mongolia. More frequently, واسو is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Waso | Mongolia, Malaysia, Myanmar, Japan, Pakistan |
| Waswo | India, United States, New Zealand, Indonesia, Germany |
| واسو | Iran, Morocco |