I think its fair to say that scenarios where a service cancels a user account because his/her name was not "realistic sounding" are few and far between. (Assuming you're not entering names like "Doorknob Toothbrush")
Well, the site did generate Iva Lavallée as a French female name for me. I had never heard of someone called Iva, but it seems it's been given to exactly 100 persons in France since 1900.
Iva Lavallée sounds like He's gonna swallow it, really.
