*wendh-

The core idea of this root was

winding, weaving

It’s the origin of to wind, to wend and to wander as well as the noun wand.
In English, that word focused its meaning on a bent stick. In German, it’s focused on what you get when you weave many long sticks together  – a wall (die Wand) :).

The word wind (as in the air) is not part of this family.