SC2 Name Change - Character name not available

Ok, so I'm using my one free name change to change my profile name to bongalak. But when I try all I get is this:

Character name not available - Please use a different name.

Why is this? I thought more than one people could share a same profile name, because everyone has a different serial code or whatnot.

Or is this a word filter thing? And if so, what's so offensive about bongalak?

 

Interesting idea about the filter thing, I wouldn't have thought about that. If it is that, it's probably because of 'bong'. Sex, offensive words, drugs, etc. are filtered out perhaps.

 

maybe because the name is so ugly too