Landyn is a spelling variant of Landon, an English surname and place name from Old English lang and dun, "long hill". The y-spelling followed Landon's rise in the 2000s and gives the name the look of Jadyn and Kadyn. Landyn entered the US top 1000 in 2004, peaked at number 365 in 2012 and has declined since, slipping out of the top 1000 in 2025 at number 1126.