Family name Kaplja (Kaplja 
) , around the world, is a rare cognomen. The surname Kaplja is characteristic of Slovenia, where it is quite a rare surname, Belarus, where it is a rare surname, and Germany, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Kaplja | Germany, Slovenia, Belarus |
| georg kaplja RU (b. 1912) |
|
|
| mirko kaplja Slovene politician, SI (b. 1944) |
|