Telesilla (Τελέσιλλα, 5th c. BCE) was the lyric poet of Argos who led the women of Argos in armed defense of the city against the Spartan king Cleomenes I (494 BCE) after most of the male warriors had been killed. The Argives commemorated her with a statue.
Telesilla 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 Telesilla reduce to 5, The Seeker. This is a traditional interpretive system, not a factual claim about the name.