Cognomen Райнгард-Тройняк (Райнгард-Тройняк 
) , across the world, is an extremely rare surname. The last name Райнгард-Тройняк is characteristic of Eastern Europe, particularly Ukraine, where it is an extremely rare surname. Parts of the name also exists independently as a last name Райнгард, and a last name Тройняк.
| VARIANT | COUNTRY |
|---|---|
| Райнгард-Тройняк | Ukraine |