Names.
About 30 years ago, in UK, I changed my name (first and surname)
No forms, no legal procedure. Under Common Law one can change their name in UK unless its for an illegal reason. I changed everything to my new name, passport, driving licence, credit cards, etc.
A woman changing her name when she marries is a custom not the law. It is neither legal nor illegal to change one's name in UK
"But notta lotta people know that ! " .