Cognomen Sundayi (Sundayi 
) , throughout the world, is a rare surname. The last name Sundayi is characteristic of Zimbabwe, where it is quite a rare surname, South Africa, where it is an extremely rare surname, and the United Kingdom. In absolute terms, it is the most numerous in Sub-Saharan Africa, particularly Zimbabwe, Nigeria, and South Africa. Much less frequently, Sundayi is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sundayi | United Kingdom, Nigeria, South Africa, Zimbabwe, India |