Family name Poskaitis (Poskaitis 
) , globally, is a very rare surname. The last name Poskaitis is habitual in Lithuania, where it is quite a rare surname, Estonia, where it is a rare surname, and Australia, where it is a very rare surname. In absolute terms, it is the most numerous in Lithuania, the United States, and Australia.
| VARIANT | COUNTRY |
|---|---|
| Poskaitis | Australia, Germany, Canada, Lithuania, United States |