Xbox Username Suffix

I see that there are numbers at the end of my account username. I'm aware that they get added when someone else has the name, but when I search up the name, it says 3 other people have it. Their names are related to mine, but they have spaces. Does this
mean we have the same username? If not, why would my account have the suffix numbers if no one has the name I want? Thank you!

:)