Indeg means "fair maiden" in Old Welsh. In the Welsh Triads, Indeg is named as one of the "Three Mistresses of Arthur" — daughter of Garwy Hir.
Featured in the Welsh Triads (Trioedd Ynys Prydein).
Indeg 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 Indeg reduce to 3, The Communicator. This is a traditional interpretive system, not a factual claim about the name.