Iset (𓊨𓏏𓆇) is the original Egyptian form of Isis — meaning "throne." Queen Iset (15th c. BCE) was the secondary wife of Thutmose II and mother of Thutmose III, who became one of Egypt's greatest pharaohs after Hatshepsut.
Iset reigned briefly as regent for her young son.
Iset 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 Iset reduce to 8, The Visionary. This is a traditional interpretive system, not a factual claim about the name.