I just wanted you to know that not only did your joke amuse me, but I have also forwarded it to several friends who I am almost certain will also enjoy it. Your joy is spreading throughout the world.
It depended on the time and place. Fitzroy is particularly associated with illegitimate children of the king, but until the 17th century revival of the Fitz prefix, it was mostly just meaning "son of" without any particular inclination towards or against legitimacy. But in the Stuart era it was frequently used for illegitimate children of royalty and nobility.
Seriously, also I wonder if there are peoples with the same surname that aren't in my family tree, cause I am sure it's more of a name of a village than a family. Keeping surnames is so weird though, very weird feudal tradition and honestly I think having a unique last name is more interesting in general. My partner changed her name to something unique she's the only one with that surname. I kept mine cause I think it's just so interesting, but part of me wishes I changed it, if not drastically then to the feminine version of the name as the language it's in is gendered.
One of my life goals is living in a house over a hill where the specific tree from my last name is planted.
here in sweden a goodly chunk of surnames are just straight up made up, shit like "nyquist" which even at the time was a hilariously pretentious way to spell "nykvist" and just means "new branch".