Bozena (Božena) combines the Slavic bog (God) and the suffix meaning "-gifted" — meaning "gifted by God." Božena Němcová (1820-1862) was the great Czech writer of Babička (Grandmother).
Bozena is widely used in the Czech Republic.
Bozena 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 Bozena reduce to 9, The Giver. This is a traditional interpretive system, not a factual claim about the name.