Syntyche (Συντύχη) is from the Greek syn (with) and tychē (fortune) — "with fortune." In Philippians 4:2, Paul beseeches Syntyche and Euodia by name to be reconciled — among the few women named directly in Paul's letters.
Patron of female church leaders.
Syntyche 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 Syntyche reduce to 2, The Peacemaker. This is a traditional interpretive system, not a factual claim about the name.