Addisyn is a modern spelling of Addison, an English surname meaning "son of Adam" that became one of the most popular girls' names of the 2000s in America. Adam itself comes from the Hebrew for "man" or "earth", and the -syn ending follows the pattern of Madisyn and Emersyn. Addisyn entered the US top 1000 in 2006 and peaked at number 374 in 2012, but it has fallen quickly since and ranks 1458 in 2025.