What's the best way to find the probability of 2 names having the same gematria (total numeric value?)

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Let's say you wanted to find the probability that someone's first name has the same simple gematria as his or her last name.

For example:

Using 1 for A, 2 for B, C for 3...Z is 26: a name like "Bob" is 2 + 15 + 2, or 19. What's the probability his last name, whatever it is (doesn't matter), is also 19?

Question is generic to the quantity of first or last name. I want to know the chances the first and last are the same. E.g., 41 and 41, 24 and 24, 10 and 10, 61 and 61, etc.

I'm looking for a basic ballpark estimate.

Thanks!