My friend K
allahar tried registering his name a dozen ways in Yahoo until he found out that apparently Yahoo does not allow IDs with certain words. Most of these are the usual profanities. However, 'osama,' 'binladen' and 'allah' were censored. Notably, 'jesus' was
not censored.
http://quickwired.com/kallahar/stories/2005-Yahoo/
Kallahar and I tried many, many ID combinations and, as you will see in the link, some of the approved ones will surprise you.