Family name Мордехай (Mordecai 
, Mordechai 
, Mordekhai 
, along with others...) , across the world, is quite a rare last name. The last name Мордехай is habitual in Israel, where it is quite a common surname, Hungary, where it is quite a rare surname, and Jamaica. Measured by absolute frequency, it most frequently occurs in the United States, Israel, and Nigeria. Likewise, Мордехай is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Mordecai | Kenya, Israel, United States, Ghana, Nigeria |
| Mordechai | United Kingdom, Israel, United States, Ghana, Nigeria |
| Mordekhai | Belgium, Israel, France, United States, Indonesia |
| Mordechaj | Poland, Israel, France, United States, Germany |
| Mordehay | Israel, France, Brazil, United States, Germany |
| Mordehai | United Kingdom, Hungary, Israel, United States, Colombia |
| Мордехай | Kazakhstan, Ukraine, Belarus, Russia |
| Mordekhay | Mexico, Israel, United States, Canada, Chile |