My children have my ex’s last name. We split up, and I would like to hyphenate their names with his last name and mine. How easy is this to do? I’m not trying to change their name to just mine; I just want to hyphenate it. The plan was to always end up with the same last name as my children as we were engaged, but now that that’s not happening, it doesn’t sit right with me that my children have no part of me as far as the last name is concerned. The process for doing this, and how easy was it to get done?