Olive comes from the Latin oliva — the name of the tree central to Mediterranean civilisation for thousands of years. The olive branch has been a symbol of peace since at least Greek antiquity; in Genesis the dove returned to Noah's ark with an olive leaf.
Olive is part of the broader return of botanical names. It was popular in the late Victorian era, faded for a century, and came back strongly in the 2010s. Today it sits in the U.S. top 200 and is rising.
Olive 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 Olive reduce to 9, The Giver. This is a traditional interpretive system, not a factual claim about the name.