Surname Ter-Avetisjans (Ter-Avetisjans 
) , worldwide, is a very rare last name. The cognomen Ter-Avetisjans is characteristic of Northern Europe, particularly Latvia, where it is a rare surname, and the United Kingdom, where it is an extremely rare surname. Parts of the name also exists independently as a last name Ter, and a last name Avetisjans.
| VARIANT | COUNTRY |
|---|---|
| Ter-Avetisjans | United Kingdom, Latvia |