Given names often turned into family names when people were identified by their father's name. For example, the first name Ahrend developed into the family name Ahrends by adding a genitive s-ending, as in Ahrend's son. Examples: Ahrends, Burkhard, Wulff, Friedrich, Benz.
OK the definition you have used for crouching associates it with stooping (which on Wikipedia redirects to bowing. Squatting essentially involves bending at the knees and hips. If there is any bending at the waist (and maybe lowering of the head) then that is considered stooping.
Squatting is among the few exercises that give a person a complete workout. This is why a squat is considered a functional form of exercise that influences a personâs health very positively. As we age, squatting strength tends to decrease and the only way to maintain it is to have a proper squat technique.