Family name Seisy (Seisy 
) , in all the world, is a very rare last name. The surname Seisy is habitual in Israel, where it is a very rare surname, Honduras, and Venezuela. Measured by absolute frequency, it most frequently occurs in Israel, Venezuela, and Mexico. More prevalently, Seisy is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Seisy | Mexico, Bolivia, Indonesia, Venezuela, Israel |