This is a list of surnames in which the usage is Russian; and the length is 6.
Kozlov Козлов m RussianDerived from Russian
козёл (kozyol) meaning
"male goat", probably used to denote a goatherd.
Pavlov Павлов m Russian, BulgarianMeans
"son of Pavel". A famous bearer of this surname was the Russian scientist Ivan Pavlov (1849-1936), known for his discovery of the conditioned reflex.