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 | Nigeria, Israel, Ghana, United States, Kenya |
| Mordechai | Nigeria, Israel, Ghana, United States, United Kingdom |
| Mordekhai | Israel, France, Indonesia, United States, Belgium |
| Mordechaj | Germany, Israel, France, United States, Poland |
| Mordehay | Germany, Israel, France, Brazil, United States |
| Mordehai | Israel, Colombia, United States, Hungary, United Kingdom |
| Мордехай | Ukraine, Russia, Kazakhstan, Belarus |
| Mordekhay | Chile, Israel, Mexico, Canada, United States |