@ajft Reminded of someone whose surname is "Null" ... and how to properly validate text entry:

"Jennifer Null’s husband had warned her before they got married that taking his name could lead to occasional frustrations in everyday life. ... When Jennifer Null tries to buy a plane ticket, she gets an error message on most websites. The site will say she has left the surname field blank and ask her to try again."

bbc.com/future/article/2016032