Mariama is the West African (Senegalese, Gambian, Sierra Leonean) form of Maryam (Mary) — beloved in Islamic tradition as the mother of Jesus. Used widely across the Sahel and West Africa.
Mariama Bâ (1929-1981), the Senegalese author of So Long a Letter, is the most famous bearer.
Mariama 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 Mariama reduce to 2, The Peacemaker. This is a traditional interpretive system, not a factual claim about the name.