Yoko Ono sues Lennon?

As heard on the radio, it sounded completely stupid: Yoko Ono sues a singer Lennon Murphy for the use of Lennon's name.

WTF, says I - since when there is a copyright on a name?

Now it appears that the story is a bit different.

Ms. Murphy's band is called Lennon, and she is attempting to register that band name as a trademark.

It's amazing how stupid can people get...