In Russia, the short, casual diminutives include:
LeraValya
Valera
Valesha
Leka
Vaka
Vava
Longer diminutives that may be used affectionately by family and close friends include:
Lerunya
Lerusya
Lerusha
Lerukha
Valeyka (Valeika)
Valyunya (Valiunya)
Valyusya (Valiusya)
Valyukha (Valyusha)
Easier-to-read transcriptions are put in brackets.
Source:
http://www.gramota.ru/slovari/dic/?pe=x&word=%D0%B2%D0%B0%D0%BB%D0%B5%D1%80%D0%B8%D1%8F