Based on the clue 'alphabetically by last name hes listed last', what is the answer?

What is referred to by 'alphabetic sign language'? Based on the clue 'alphabetically a select list of endangered species...', what is the answer? Based on the clue 'alphabetically baseball hall of famers run from hi...', what is the answer? Based on the clue 'alphabetically by first name hes listed last', what is the answer? Based on the clue 'alphabetically countries here run from a v', what is the answer? Based on the clue 'alphabetically first among the 150 most populous u...', what is the answer? Based on the clue 'alphabetically first among the uns 6 official lang...', what is the answer? Based on the clue 'alphabetically he was first among jesus 12 apostle...', what is the answer?