Is "la" the possessive particle?
Yes, aka -a of association
So ni is is okay
ni = am, is, are
So la means "of the"?
Is Jina always by itself in the middle of a sentence
Jina means name. I don't understand your question
What is the difference between the m- and wa- prefixes for different nationalities? (Ex: Mkenya and Wakenya)
M- is for singular, wa- is for plural
Im confused on how to use jina and ni in a sentence
You are understand