Family name Sladzevskis (Sladzevskis 
) , around the globe, is a very rare last name. The family name Sladzevskis is habitual in Northern Europe, particularly Latvia, where it is quite a rare surname, Estonia, where it is a rare surname, and Lithuania. In absolute terms, it is the most numerous in Northern Europe, particularly Latvia, Lithuania, and the United Kingdom.
| VARIANT | COUNTRY |
|---|---|
| Sladzevskis | Estonia, France, Latvia, Lithuania, United Kingdom |