How to choose the right number from name?

I have to name my daughter.
From, her date of birth, how do i choose her name?
What should be the final number?

Can they have any number? Should i name her according to her date of birth number?

I have chosen a name which has only first and last name. There is no middle name.

Please advice.
For example, if the sum of her date of birth is 9, what number should her name have?