This is the 8242nd most frequent German word.
janina
"Janina" is a proper noun, typically a female given name in German, with no standalone definition.
In this sentence, 'Janina' is a proper noun, used as a person's name, identifying someone specifically.
Janina ist meine beste Freundin.
Janina is my best friend.
Here, 'Janina' is again a proper noun, referring to a person's name, indicating interaction with a specific individual.
Ich habe mit Janina gesprochen.
I spoke with Janina.
In this usage, 'Janina' is a proper noun, inquiring whether a specific individual can participate in an event.