Junko (純子) combines jun (pure, genuine) and ko (child) — "pure child."
Junko Tabei (1939-2016) was the first woman to summit Mount Everest (1975) and the first to complete the Seven Summits.
Junko 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 Junko reduce to 8, The Visionary. This is a traditional interpretive system, not a factual claim about the name.