In 2018, 85 is the most common age for an American (U.S.) Lucille who is registered female with the Social Security Administration. It is the 490th most common female first name for living U.S. citizens.
― Anonymous User 10/15/2018
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It's strange that, though Lucy is sometimes used as a diminutive of Lucille (as in Lucille Ball's case), historically it's the other way around! (No reason that either should not be used as a full name or used as a diminutive for the other, of course -- and, of course, they are!)