From Kate & Allie to Ally McBeal to the smarter-than-her-parents daughter on Everybody Loves Raymond, this nickname is so ubiquitous in pop culture that it has become a name in its own right.
Variations
Ali,
Ally
Nicknames
Al
Popularity rankings from the Social Security Administration
About name popularity rankings
You may find some surprises -- for example, who knew Jennifer was a boy's name? Because this feature uses actual Social Security data, it includes the human error that attends a large survey, but it still reliably reflects the patterns of naming fashion.
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