Is there a word or name in French that sounds like If so does anyone know what it means?

You are likely thinking of the French word "s'il", which is pronounced very similarly to "if".

"S'il" is a contraction of "si il" which means "if he".

It's important to remember that in French, words often change pronunciation depending on their placement in a sentence. So, "s'il" would only be pronounced like "if" when it's at the beginning of a sentence.