Josie is the diminutive of Josephine — from the Hebrew Yosef, meaning "God shall add" (referring to the matriarch Rachel's prayer for more children).
Josie entered the U.S. top 1000 in 1880 and is rising again. The character Josie Pussycat (from Josie and the Pussycats) and Josie Geller in Never Been Kissed are well known. Today Josie sits in the U.S. top 300.
Josie 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 Josie reduce to 4, The Builder. This is a traditional interpretive system, not a factual claim about the name.