Haddon \ha(d)-don\ as a boy's name is a variant of Hadden (Old English), and the meaning of Haddon is "hill of heather".

The baby name Haddon sounds like Hadon, Haddin, Haddan and Haydon. Other similar baby names are Hardon, Haimon, Hedeon, Haden, Hadwin, Hadwyn, Hakon, Hacon, Haakon, Halden, Haldan, Halton, Harden, Hardin, Hayden, Haydn, Haydan, Hudson, Jaydon, Jaedon, Jadon, Kadon, Kaydon, Kaidon, Caydon, Caidon and Raydon.