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.
So accordingly. 1  some crouching positions are squats. 2  some crouching positions may not be squats. 3  squatting is not implicity crouching.  squatting and crouching are terms with different but overlapping definitions, the former more specific to posture, the latter to 1  motivation. squat is not a synonym for crouch.
The squat is a classic, multi-joint exercise that targets a variety of muscle groups throughout your body, emphasizing those that extend your hip and knee joints. There are many variations, but the most popular may be the parallel back squat, which involves balancing a barbell across your shoulders and upper back, and squatting until your thighs are parallel to the floor.