Cognomen סילאי (Silai 
, סילאי 
) , in all the world, is a rare last name. The cognomen סילאי is characteristic of Romania, where it is a rare surname, Hungary, and Tanzania. Not in comparison with a country's population, it is the most numerous in Romania, Indonesia, and Tanzania. More frequently, סילאי is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Silai | Indonesia, Romania, China, India, Tanzania |
| סילאי | Israel |