Addison is an Old English surname meaning "son of Adam" — itself from the Hebrew *adamah* (earth). **Originally masculine; shifted overwhelmingly feminine in the United States after 1995 in the wave of surname-as-girl-name fashion (alongside Madison, Mackenzie, McKenna)**. **A top-15 US baby name for girls from 2007 to 2019, peaking at #11 in 2007**. **Addison Rae (born 2000)** — born Addison Rae Easterling — American TikTok personality with over 88 million followers (third-most among individuals on the platform); **founded ITEM Beauty cosmetics in 2020**; second-most-followed person on TikTok at her peak. **Addison Montgomery** is a major character in *Grey's Anatomy* (2005-2012) and *Private Practice* (2007-2013), played by Kate Walsh.
Featured throughout 2000s-2010s American culture and the rise of surname-as-girls-name fashion.
Addison reduces to four — the number of son of Adam.