Where does “vodák” come from?

vodák (Czech) comes from Czech voda, from Old Czech voda, from Proto-Slavic vodà, from Proto-Balto-Slavic wandō, from Proto-Indo-European wódr̥, from Proto-Indo-European wed-, from Proto-Indo-European wey- — to wither; fade; to move, go ahead; to be strong;...

vodák (Czech): paddler