The Dutch form
Anneke may be considered a nn, I don't know.
But
Annika in Sweden is certainly not considered or used as a nn.
One famous
Annika in Sweden is Pippi's friend in the books about Pippi Longstocking by
Astrid Lindgren.
There is another Swedish name, Majken, which I think comes from a Dutch pet name for
Maria, but this is certainly not seen as a nn in Sweden.
"You sought a flower and found a fruit. You sought a spring and found a sea. You sought a woman and found a soul. You are disappointed."
"It does not become me to make myself smaller than I am." (
Edith Södergran 1891-1923)