[shalom aleichem]

The Doctor’s signature appears to be close to “Ukulele” which is a common Hawaiian instrument, small guitar, which early TV star Arthur Godfrey made famous. LOL
http://iowntheworld.com/blog/wp-content/uploads/2011/04/Picture-14.jpg

[muawiyah]

I don't think that's the doctor, but rather a gentleman with four traditional Chinese names, three of which he represents with initial letters only ~ followed by Lee.

Looks pretty legit. There are people who say he actually existed.

[Mr.Unique]

Ukulele

See post 134 for another BC with that name. It may be true.