Marsha is a variant of Marcia — from the Latin Mars, the Roman god of war. Marsha P. Her body was found in the Hudson River on July 6, 1992; initially ruled suicide, the case was reopened in 2012 as possible homicide.
Johnson (2017 Netflix documentary).
Marsha 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 Marsha reduce to 6, The Nurturer. This is a traditional interpretive system, not a factual claim about the name.