Meaning and Name Origin
Elly \e(l)-ly\ as a name for girls is of Old French, Old German and Greek origin, and the name Elly means "other, foreign; sun ray". Elly is a variation of Eleanor (Old French, Old German): from an Old French respelling of the Provenšal name Alienor, from German ali, though sometimes it is taken as a variant of Helen. Elly is also a form of Ella (Old German): originally a short form of names containing ali (compare Eleanor). Elly is also used as a form of Ellen (Greek), Ellie.
Elly has 30 more alternative forms via Eleanor, Ella, Ellen, Ellie, Helen: El, Elan, Elana, Elayne, Elen, Elena▲, Elene, Eleni, Elenyi, Elin▲, Ellan, Elle▲, Elleen, Ellena, Ellene, Ellin, Ellina, Ellon, Ellyn, Elna▼, Elon, Elora, Elyn, Elynn, Hella, Nell▼, Nelle▼, Nelley, Nelli and Nelly.
Elly is a somewhat prominent first name for women (#2802 out of 4276, Top 66%) but an unusual last name for both adults and children. (2000 U.S. Census)
Below is a charted analysis of the popularity of the girl name Elly and affiliated names. Popular variation forms of Elly (#unlisted) appearing in the Top 1000 are Elayne, Eleanor (#78 a year ago), Elena (#121), Elin (#733), Ella (#17), Elle (#395), Ellen (#656), Ellie (#55), Elna, Helen (#404), Nell, Nelle and Nelly. These girl names reached the peak of their popularity during the years 1900-1909 and are somewhat less popular today, with the versions Ellen, Elna, Helen, Nell and Nelle becoming somewhat outmoded. The most fashionable birth names in this compilation are Eleanor (#78), Elena (#121), Elin (#733), Elle (#395) and Ellie (#55), with Eleanor and Ellie having a resurgence in popularity. (2014 Birth Statistics)
Elly is alike in pronunciation to Aley, Alley, Alli, Ally▼, Eila, Eiley, Eily, Elah, Eli, Elia, Eula▼, Illa, Olla, Ulla, Ulli, Wally and Willy. Other suggested similar baby names are Elsy and Elvy. These names tend to be less commonly used than Elly.