Severina is the Italian/Croatian feminine form of Severin — from the Latin severus (stern, serious, severe). Severina Cirilová — Czech historical figure. Severina Beltrán — modern figure. Princess Severina — South Slavic-Italian heritage naming.
Severina 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 Severina reduce to 3, The Communicator. This is a traditional interpretive system, not a factual claim about the name.