Surname Janusi (Janusi 
) , throughout the world, is a very rare cognomen. The surname Janusi is habitual in Tanzania, where it is a very rare surname, Malaysia, and Brazil, where it is an extremely rare surname. Likewise, Janusi is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Janusi | Malaysia, Nigeria, Tanzania, India, Brazil |