@ resembles both the feminine ending/element a and the masculine o.
The pronunciation ending in /-aʊ̯/ is from how Latinao would be pronounced; the one ending in /-eɪ/ uses (approximately) the sound of Spanish -e, a vowel between a and o.
Pronunciation
IPA(key):/ləˈtinaʊ̯/, /læˈtinaʊ̯/, /ləˈtineɪ/, /læˈtineɪ/, or as the full phrase "Latino and Latina"