I booked my family with Ryan Air. I used my wife's name Wiesje - it's a common short form of Willemiena, same as Tony in place of Anthony, or Mike in place of Micheal.
The check-in service insisted this was a passenger change and charged Euro 125.00.
Incidently, this is the highest charge in the industry by a large margin.
I appealed to Ryan Air and after a long time received a standard form reply directing myself to their Terms and Conditions - without stating which clause they were invoking. A second appeal received the same response.
I was left feeling decidledy "ripped-off".
A better relationship with their passengers may even produce more business for Ryan Air.