What are challenges with multiple middle names

Hello
I will apply for my new born baby passport soon in my home country.
Local authority have issues birth certificate with two middle name (Mother + Fathers)

Basically my daughter have 4 words in her name.

I am trying to understand What challenges will person with more than 3 words in name face in Japan. And based on that consider a name change before passport application.

Thank you

by Life_Conn4361