A common nickname, often short for Millicent, Amelia, or other names beginning with 'mill-' or containing that sound.
A diminutive or pet name derived from longer names. In English, adding '-y' or '-ie' to names is a traditional way to create informal, friendly versions (like Billy from William).
Nickname patterns reveal something cool about language—English speakers naturally shorten long names and add '-y' to make them affectionate, which is why you hear Milly, Billy, Sally, and Jenny everywhere.
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