The library doesn't work for latino names, in Spanish and Portuguese we have 2 surnames, ie:

Spanish: Rafael Nadal Parera
Portuguese: Cristiano Ronaldo dos Santos Aveiro (in this case Cristiano is the first name, Ronaldo de second name and the rest surnames)

Also, we can have several names, they are not called first and middle name, but fist, second, third names...

I guess it not an easy thing to implement, but there are around 700M people on that group :-)