The only free and comprehensive online etymological dictionary of the Spanish language
-ano Adjective-forming suffix expressing relationship. Also noun-forming for the names of hydrocarbon compounds.
From Latin -anus 'id.' An adjective-forming suffix denoting a relationship to the noun. A merger of the -a- stem and suffix -nus, a simple noun-forming suffix (see -no).
Asturian -anu, Portuguese -ão, Galician -ano, Catalan , French -en, ien, ain, Italian -ano, Romanian -ân, -an