Cognomen Lốc (Block 
, Lốc 
) , throughout the world, is a common family name. The family name Lốc is habitual in Western Europe, particularly Monaco, where it is quite a common surname, Belgium, and Germany. Not in comparison with a country's population, this name is the most popular in the United States, Germany, and Belgium. Much less frequently, Lốc is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Block | Belgium, Poland, United States, Germany, Canada |
| Lốc | Vietnam |