Family name Sinthian (Sinthian 
) , worldwide, is an extremely rare cognomen. The family name Sinthian is characteristic of Latin America and the Caribbean, particularly Nicaragua, where it is a very rare surname, Honduras, and Venezuela. Likewise, Sinthian is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sinthian | Honduras, Brazil, Venezuela, Nicaragua |