If I had kept my biological father’s surname…
There would be only 1 person findable with that first name + surname combo. In the whole of internet. I know, I did a “stalk myself” experiment.
No one else in this country. And since the linguistical impact of Finnish is so small, unlikely to be found from anywhere else either, due to surname’s structure which is fairly unique to this language.
My name + family surname makes me pretty much impossible to google, since there are so many with this combo; when I was still in university, there were eight of us with the same name at the same time.
If I picked my Significant Otter’s surname as mine, I would be back to square one in uniqueness.
My other username is pretty common. This one is more rare, but it ticks me off that someone else who also uses this nick elsewhere is pretty much an exact opposite of me… for the record, if you come across with someone who uses this nick, but posts oddly closed-minded crud, it is not me.