Iguana
Animal names that end with the letter o:armadillobuffalocuckoogeckokangaroo
human
Ducks
mastiff
Monkey Monkey
KABOTAR
donkey monkey
You can use names from mythology, such as Theseus. You could also pick and animal and add 'Man' at the end to make a hero name, such as Spiderman.
AlpacaAnacondaApis dorsataApis dorsata laboriosaArowanaBabirusaBarracudaBoaCapybaraChihuahuaChinchillaChuckwallaChupacabraCobraEkaltadetaFleaFossaGorillaHapukaHuiaHydraHyenaIguanaImpalaJanenschiaJerboaKoalaKookaburraLlamaMaiasauraMambaMaraMoaNutriaOropendolaPandaPiranhaPumaQuaggaQuokkaRheaSaigaSeriemaSifakaTarantulaTayraTuataraTunaVicunaXenarthraZebraZorilla
Pony, donkey, monkey...
ox
There is monkey, puppy, kitty, donkey, that is just ending with y. I don't know of any ie endings.