Mariami is from the Georgian მარიამი (Mariami) — Georgian rendition of Mary / Maryam (Hebrew Miriam). Mariami is one of the Georgian feminine names — central to traditional Georgian Orthodox Christian heritage. Georgian feminine name reflecting Caucasian Orthodox heritage.
Mariami 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.
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In Pythagorean numerology the letters of Mariami reduce to 1, The Leader. This is a traditional interpretive system, not a factual claim about the name.