This is the 953rd most frequent Afrikaans word.
anna
In Afrikaans, "anna" is a colloquial or informal alteration of "ander," meaning "other" or "another."
The word 'Anna' here is used as a proper noun, serving as a name.
Ek ken 'n vrou genaamd Anna.
I know a woman named Anna.
Here, 'Anna' is used as a proper noun indicating authorship or origin of the song.
Hulle het na 'n liedjie geluister deur Anna.
They listened to a song by Anna.
In this sentence, 'Anna' is again a proper noun, representing an identity or pseudonym used by the author.