Loretta is an Italian-English elaboration of Laura — possibly also from the Italian shrine of Our Lady of Loreto in the Marche region. Married at 15 to a 21-year-old; had four children by age 19; wrote about birth control ("The Pill," 1975) and Vietnam ("Dear Uncle Sam," 1966) when both were taboo in country music. Loretta Young (1913-2000) — American actress; Oscar (1947).
Loretta 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 Loretta reduce to 1, The Leader. This is a traditional interpretive system, not a factual claim about the name.