Eliška is the Czech form of Elizabeth — from the Hebrew Elisheva, meaning "my God is an oath" or "pledged to God."
Eliška Junková (1900-1994) was the Czech racing driver, one of the greatest woman racing drivers of all time.
Eliška 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 Eliška reduce to 7, The Seeker. This is a traditional interpretive system, not a factual claim about the name.