I have a Catherine Margaret Fichtelmann b abt 1882 Bklyn, NY in my line who married a Henry Von Braunsberg in May 1903 in Brooklyn, NY. This Henry was born about 1872 NY, son of Carl Von Braunsberg & Catherine Oltmann, both born Germany. I believe Henry had just one daughter, Dorothy Von Braunsberg b abt 1904 Bklyn, NY. Know nothing further about her.
Wonder if there could be a connection to your Carl, but since you didn't give years, it's hard to tell.
This Henry Von Braunsberg died in 1936 and is buried in the Lutheran Cemetery. His death cert says "Braunsberg." He is buried with a Catherine Braunsberg who died in 1900 [assume his mother] and a Catherine Braunsberg who died in 1961 [assume this was his wife]
Also, have found them with various spellings on census: Bronsberg, Brounborg and Brownberg.