yes   
aikany
a vulgar phrase expressing assent. Yes indeed! True! [Richardson 1885]
eka
yes! precisely! it is true. Used in expressing approbation. See [Richardson 1885]
eny
yes [Hallanger 1973]
ia
yes; "provincial" but also used in Imerina [Hallanger 1973]
ie
a provincial word for yes. See eny [Richardson 1885]