This is the 3043rd most frequent Swedish word.
kaja
"Kaja" means "jackdaw," a type of small black and grey bird.
Here, 'kaja' is used as a noun referring to the bird species known in English as jackdaw.
Jag såg en kaja flyga över taket.
I saw a jackdaw flying over the roof.
In this context, 'Kaja' is a proper noun, used as a given name.
Min vän kallar sin dotter Kaja som ett smeknamn.
My friend calls her daughter Kaja as a nickname.
Here, 'kaja' is used as a verb in a colloquial or idiomatic expression meaning to tidy or adjust.