I changed the name on my Apple Watch like I do on all my Apple products.
My wife had an original iPod shuffle called Shufflufugus.
She also had a 2nd generation Nano Product Red called Nanolicious.
My iPad Nano 6th generation (the little square one) is called Nano Nano (Mork and Mindy reference).
I'm big Lord of the Rings fan, so most of my recent iPhones have been named along those lines.
Black iPhone 4: The One Phone
White iPhone 5: Gandalf the White
White iPhone 6 Plus: Mithrandir
My iPad Mini Retina: dadPad
and my Apple Watch: Watch This