Aidyn is one of the many spellings of Aidan, the anglicized Irish Aodhán, a diminutive of Aodh, "fire", and therefore read as "little fire". The y spelling rode the Aidan wave of the 2000s. Aidyn stood at number 5591 in 2000, entered the top 1000 in 2006 and peaked at number 642 in 2011; it has since fallen out of the top 1000 to number 2994 in 2025.