Combine two queries to check for duplicates in MySQL?

I have a table that looks like this:

Number  | Name 
--------+--------
123     | Robert

This is what I want to do:

If the Number is already in the database, don't insert a new record.

If the Number is not in the databse, but the name is, create a new name and insert it. So for example, if I have a record that contains 123 for Number and Bob for Name, I don't want to insert it, but if I get a record that contains 456 for Number and Robert for name, I would insert 456 and Robert1. I was going to check for duplicates individually like:

SELECT * FROM Person where Number = 123;

//If number is not found
SELECT * FROM Person where Name = 'Robert';

//If name is found, add a number to it.

Is there a way I can combine the two statements?