Tyche (Τύχη) is the Greek goddess of fortune, chance, and prosperity — daughter of Zeus or Oceanus depending on tradition. Each ancient city had its own Tyche depicting its specific fortune; the Tyche of Antioch (4th c. BCE) is one of the most famous statues of antiquity.
Rare but iconic in Greek studies.
Tyche 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 Tyche reduce to 7, The Seeker. This is a traditional interpretive system, not a factual claim about the name.