Marpessa (Μάρπησσα) means "snatcher" in Greek. The princess of Aetolia who was given the choice between marrying Apollo or the mortal Idas — she chose the mortal, explaining that Apollo would abandon her in old age while a mortal would grow old with her. One of the few Greek figures to choose mortal love over divine.
Marpessa Dawn (1934-2008) was the African-American actress who starred in Black Orpheus (1959).
Marpessa 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 Marpessa reduce to 2, The Peacemaker. This is a traditional interpretive system, not a factual claim about the name.