This is the 951st most frequent Finnish word.
aki
"aki" is a Finnish male given name.
In this sentence, 'Aki' is used as a proper noun, which is a common Finnish male name.
Aki on ystäväni.
Aki is my friend.
Here, 'Akilla' is the adessive form of the proper noun 'Aki', indicating possession or association in Finnish.
Akilla on uusi polkupyörä.
Aki has a new bicycle.
In this usage, 'Akille' is the allative form of the proper noun 'Aki', indicating movement or action directed toward Aki.