I will start
Banghard - so cringy
Lol! Agreed, most unfortunate 
That is quite unfortunate. 
Banghard is pretty awful.
The worst ones I can think of off the top of my head are;
[name_m]Dick[/name_m]
Dingbro
[name_m]Pollock[/name_m]
Lol here is a funny little article on the decline of some unfortunate surnames: