Hagar (הָגָר) is the Egyptian handmaid of Sarah in the Book of Genesis — mother of Ishmael, ancestor of the Arab peoples in Islamic tradition. After being expelled, she was promised by God that Ishmael would father a great nation.
Hagar is widely used in religious families across Jewish, Christian, and Islamic traditions.
Hagar 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 Hagar reduce to 8, The Visionary. This is a traditional interpretive system, not a factual claim about the name.