Cognomen Merariu (Merariu 
) , in the world, is an extremely rare family name. The last name Merariu is habitual in Israel, where it is a very rare surname, Canada, where it is an extremely rare surname, and the United Kingdom. Measured by absolute frequency, it is the most numerous in Canada, Brazil, and Israel.
| VARIANT | COUNTRY |
|---|---|
| Merariu | United Kingdom, Canada, Israel, Brazil, United States |