Cinderella calls me by first name and probably will for the foreseeable future. And I am just fine with that. However, if you are newly stepped and would like your stepchildren to call you something other than your first name, or are currently facing a situation like this, I put together this list to help you along the way:
OtherMom (Om / Ommy)
ExtraMom (E.M. / EM / Emmy)
Mom/Mommy + First Name (Mom-Cathy)
Mom/Mommy + Initial (Mommy-C)
You could try a unique variation of your first name, such as "Cat" for Catherine.
Or come up with a special nickname that relates to something unique to you and your stepchild. For instance, if you both love Oreos, they can call you “Cookie.” If you are a bit wicked, like the author of this post, why not "Apple." (If Gwynneth Paltrow can do it, why not you?)
Try Mother/Mommy in another languages:
No matter what you decide, make sure it's mutual. Don't force your stepkids to do something they (or you or your hubby) are not comfortable with.
And as difficult as it may be for some, always take BioMom's feelings into consideration.