Here you will find all the characters that have used the alias Giant-man/boy/girl/woman. Note: this does not include Ant-men, Goliath, Yellowjackets, etc.

Prime Universe

Hank Pym
First Giant-man
Giant-man Skrull
(NCS coming eventually)
Janet Van Dyne
Sometimes goes by Giant-Girl/Woman

Other possible future figures (Prime Universe only); Raz Malhotra | Ultimatum