Here in Belgium a middle name isn't important at all, as people never use it! Kids get extra names though, but these name or names are just the names of the godmother and godfather. Sometimes parents change the name to the female version when it is a girl! My parents forgat to do this, so I am wearing a male name as 3rd name
But like I said, we never use our extra names here at all!
What is my full name like then: Lutgarde Mariëtte Jacques
Lutgarde is the name of e Flemish saint; my parents and all my friends shorten my name to "LUT"
Mariëtte is my godmother (mom's 3rd sister), and Jacques (male name ) is my godfather(dad's younger brother).

We didn't do this with our kids' names. Our son kept his original name from Korea, we only skipped an "o" in his first name, to make it easier for him. So his full name is JO HYUN (used to be JOO HYUN) . For our daughter we chose another but also Indian name, because the one she had in India was to difficult for here! We chose her new name from a list of Indian names, and kept her original name as her second name! So her full name is now Indra Mukul.

I hope that my explanation is clear??