This is not a technical problem, but a user issue - people are choosing the wrong name when they want to mention Skater'sMum. We can ask people to take care, but there is nothing else we can do.
However, if you go to your profile, choose 'Profile Info' and then 'Mentions' and scroll down to the bottom of the page you will see a box with a tick in it labelled 'E-mail mention notifications'. Remove the tick and you will not receive emails when you are mentioned. Any mentions made in error will still show in your profile, but you will not be notified of them.