Last name Martynus (Martynus 
) , all around the world, is a rare cognomen. The family name Martynus is habitual in Poland, where it is a rare surname, Germany, where it is a very rare surname, and the United Kingdom, where it is an extremely rare surname. Measured by absolute frequency, the name is most common in Poland, Germany, and the United States. Also, Martynus is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Martynus | Germany, Brazil, Poland, United States, Indonesia |