If it were so important to your husband that you share a last name with him and the children, why didn’t he change his name to Rosman? After all, it’s easy to spell and easy to pronounce in English. I don’t understand why you permit him to make this your problem.
Oh, and his little “jokes” with perfect strangers and your own children about your surname, and the fact that you wrote about them in the Wall Street Journal? Maybe you two should see a counselor.
Good luck with that,