Most if not all names from my country (Ukraine) as well as Russia and Belarus have more than 4 nicknames. Listing them all is too much. So,
Examples;
Yevhen –
Zhenya, Zheka, Zhenyok, Zhenchyk, Zhenko, Yevhenko, Henya, Zhesha, Hena, Yevhesha, Yevhekha, Yenya (
Yevhen could also be Zhenusya or Zhenka but those are more common for a
Yevheniya).
Oleksandra –
Sasha (also
Sashka, Sashko),
Sanya,
Olesya,
Lesya,
Sandra, Oleksasha, Sanka, Oleska,
Shura (or Shurka), Olechko, Oleshko (
Oleksandra could also be
Olya or Olka but those are more common for an
Olha).