Atze

Etymology
Attested since the end of the 18th century and originally probably from the Netherlands. While most likely a diminutive, it is which given name Atze has developed out of; it likely emerged in different dialects independently. Candidates include, and  (whence ). The similar sounding diminutive developed from  with  being attested since 1259 in the Lake Constance region.

Alternatively, a from.

Noun

 * 1)  big brother
 * °N, °W
 * 1)  mate, buddy, dog