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.
waddle-walking with short steps and the weight tilting from one foot to the other; ducks walk with a waddle. gait-a person's manner of walking.adÂ·dle. intr.v. wadÂ·dled, wadÂ·dling, wadÂ·dles. 1. To walk with short steps that tilt the body from side to side.