Sorry if this is in the wrong section!

Both my ex DH and myself are remarrying new partners. Our kids have his name still, my baking bub will have my maiden name until such a time as I marry, then will change it (it's what DF and I have decided, please don't question why or try changing my mind, it's for personal reasons).

My question is, for those that have remarried, did you change your 'existing' kids surnames or just leave them be - assuming they have your married name of course