Worldwide, Mecys (Mecys 
) is an extremely rare male first name. Very seldom, Mecys is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Mecys | Canada, Brazil, Lithuania, United States, United Kingdom |
Mecislaus, Mecislovas, Mečislovas, Mečys, Mieczyslaw, Mieczysław, Mieszko, Мечислав, Мечыслаў, Мешко, and Мєчислав