Luella is a Victorian American combination of Lou (Louise) and Ella — possibly from the Old Germanic hlud ("famous") + aelf ("elf, sprite"). Luella Webster — early Hollywood character actress.
Luella 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 Luella reduce to 9, The Giver. This is a traditional interpretive system, not a factual claim about the name.