If you're Portuguese then you should use
Joaquim, not
Joaquin.
It's not common in young people/children, but here are some combos:
Joaquim Manuel (probably the most common one)
Joaquim António
Joaquim AlexandreJoaquim MiguelJoaquim PedroJoaquim DanielJoaquim Gonçalo
Joaquim FranciscoJoaquim PauloJoaquim RafaelJoaquim DavidJoaquim EduardoJoaquim SamuelJoaquim FernandoJoaquim Gabriel
This is what I can come up with at the moment. Sorry but since I don't really like
Joaquim it's a bit harder for me to think of middle names.
Hope this helps :-)