Old Spanish

Portuguese-homem
Spanish-hombre
Old Spanish-?

castellano de hoy en día: hombre
castellano antiguo: omne
latín: hominem

Omne-hombre. Strange evolution.

The evolution is strange my friend.

Syncope, followed by dissimilation, followed by epenthesis.

homine > omne > omre > ombre

At least it recovered initial H.

Great sites regarding Old Spanish pronunciation and vocabulary evolution:

http://latine.iespana.es/latine.index.html

http://www.humnet.ucla.edu/santiago/osppron.html

Old Portuguese and Old Spanish looks very similar :coraçon -coraçon (corazon-coração),fazer-fazer (hacer-fazer).