Feidhelm is from the Irish Feidhelm / Fedelm — beauty, lasting Old Irish Fedelm. Feidhelm is one of the Irish feminine names — central to traditional Irish mythological heritage. Irish feminine name reflecting Celtic mythological heritage.
Feidhelm 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 Feidhelm reduce to 8, The Visionary. This is a traditional interpretive system, not a factual claim about the name.