Can I strongly suggest you don't use the same first initial? I accidentally did because one was to be known by her nickname. Now all formal documents come to A. Surname for both children which is just irritating. It is also annoying for labelling - it might sound cheaper if all your labels are the same but when all your clothes are similar sizes it really helps to have different labels in them. On top of that there are a lot of items that just get labelled by an initial.