This is the 5036th most frequent Catalan word.
aitor
"Aitor" is a proper noun, typically a Basque male given name, and not a Catalan word.
In this sentence, 'Aitor' is used as a proper noun, referring to a person's name.
En Aitor va venir a la festa ahir a la nit.
Aitor came to the party last night.
Here, 'aitor' is interpreted as a supporter or someone who provides support.
Sempre em sembla un bon aitor en situacions difícils.
I always find him a good supporter in difficult situations.
In this case, 'aitor' is used to denote a contributor or facilitator.