Cognomen Ipaja (Ipaja 
) , around the globe, is a rare surname. The cognomen Ipaja is habitual in Sub-Saharan Africa, particularly Tanzania, where it is a rare surname, and Nigeria, where it is an extremely rare surname. Very seldom, Ipaja is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ipaja | Tanzania, Nigeria, India |