I absolutely ADORE
Leopold! And
Leo (as a nn)is so cute!
Of your combos I like
Leopold Samuel best.
Some other suggestions:
Leopold Augustus (my favourite boys name at the moment)
Leopold IsaiahLeopold OliverLeopold MatthiasLeopold AlexanderLeopold BartholomewLeopold SebastianLeopold CorneliusLeopold Aaron
And as a mn (
Leopold is one of those names that works as a mn for almost any first name):
Adrien LeopoldNathanael LeopoldCharles LeopoldGeorge LeopoldSimon Leopold