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You are right, there are some forms of Vladimir:

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Vova (or as you wrote Wowa)
Volodya
Vovochka
Vlad (rare)
Vovka (a little familiar!)
Vovan (for friends)
Volod'ka
Vovanchik
Vovkin (ironic {actualy this word means Vova's })

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and many other nicknames depends on Vladimir's friends