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.
Crawling is probably the first way your baby will get moving. She may start by shuffling around on her tummy, also known as the commando crawl. Soon your baby will learn to balance on her hands and knees. From this position she can push off with her knees to move forwards and backwards.