We have both our girls full names that can be shortened. Dd2 tends to get hers extended (full first and second name because it is so beautiful) whilst DD1 gets gets shortened. We intended the full names would be used for formal occasions or if they felt they wanted the full version. Dd1 finds it nice having the option as there are 3 girls in the school with her name - but all are the short version only. It makes her distinguishable.

I really considered what it would be like for them in their senior years. We gave them names that are adjustable for each phase if their lives.