Name signs are often given by the deaf that associates the first letter of the person's name and some other area of the body.
My parents are deaf so since my mother (she can speak but not hear) can't say my daughter's name Sierra correctly she says SK and that is her sign as well. Just the letters SK signed together.
My name, Kimmy, is a K moved back and forth in front of the body. My husbands name Steve is an S tapped to the center of the chest.
So whatever you feel is a good fit for the name then go for it.
The only thing is to make sure the sign is always consistent, so that there is no confusion.
Have fun!