Haydn \ha(y)-dn\ as a boy's name is a variant of Hayden (Old English), and the meaning of Haydn is "hedged valley".

The baby name Haydn sounds like Haydon and Haydan. Other similar baby names are Cayden, Hanan, Hadden, Hadon, Haden, Haddin, Haddon, Haddan, Hadi, Hagen, Hagan, Haydar, Hakon, Hakan, Hacon, Halden, Haldan, Haylan, Halen, Han, Harden, Hardon, Hardin, Harun, Hasan, Haven, Havin, Hazen, Hazin, Jaydon, Jayden, Kaydon, Kaydin, Kayden, Kaydan, Caydon, Caydin, Caydan and Raydon.