Edith comes from the Old English Eadgyth — composed of ead (prosperity, blessing) and gyth (strife, war) — meaning "prosperous in war" or "blessed warrior." The Anglo-Saxon Saint Edith of Wilton (961-984) was an early bearer.
Edith was hugely popular in the late 19th century — peaking at #5 in 1880. After a long decline it has returned, particularly with the prominence of Edith Crawley in Downton Abbey (2010-2015). Today Edith sits in the U.S. top 400 and is climbing fast.
Edith 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 Edith reduce to 1, The Leader. This is a traditional interpretive system, not a factual claim about the name.