An informal or shortened form of the name 'Addison' or 'Adelaide'; often used as a given name for children.
From Germanic names 'Adelaide' (Old High German 'Adalheidis': 'adal' noble + 'heid' kind/type) or 'Addison' (Old English meaning 'son of Adam'). 'Addie' is a casual nickname formed by shortening and adding the diminutive '-ie' suffix.
Nickname patterns reveal how informal English works—'Addie' for 'Addison' shows we love shortening names AND adding '-ie' or '-y' to make them cute, which is why almost any name gets turned into something ending in those sounds in casual speech!
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