Annika is a Swedish and Scandinavian diminutive of Anna, keeping that classic name's meaning of grace and favour while adding a crisp, Nordic lilt. It is warm and friendly, yet clean and modern.
Annika does not currently appear in the US Social Security Administration's top 1,000 girls' names, so we don't publish a US rank or birth count for it. That says nothing about the name's standing elsewhere in the world — only that it sits outside the ranked US data we rely on.
In Pythagorean numerology the letters of Annika reduce to 5, The Seeker. This is a traditional interpretive system, not a factual claim about the name.