Another online list of Avengers name for anyone to comment on:
https://www.ranker.com/list/list-of-every-avenger-of-all-time/super-hero-teams

Captain America a.k.a. Nomad, The Captain
Steven Rogers

-wasn't it confirmed by Stern/Byrne that it was officially just "STEVE"?

Black Widow (Claire Voyant)
Natalia Alianovna Romanova (a.k.a. Natasha Romanoff)

-wow, that's just embarrassing. She never used the Golden Age name even as an alias, afaik.

Mantis
Mandy Celestine (alias)

-"CELESTINE"? Never happened, right? Ya'd think since we learned Duquesne's name that we'd have learned her full family name by now. Sheesh.

Moondragon
Heather Douglas (a.k.a. H.D. Steckley)

-remind me what issue she went by "STECKLEY"?

Sersi
Circe (a.k.a. Sylvia Sersi)

-remind me what issue she went by "SYLVIA"?

Captain Britain a.k.a. Lionheart
Kelsey Leigh Shorr

-wow, that's just embarrassing too. Her file photo is of Brian. Other wrong photo matches are bad too but this is wrong gender!

Ares
Ares (a.k.a. John Aaron)

-remind me what issue she went by "JOHN AARON"?

Magdalene
Marissa Darrow

-is Magdalene her realname or codename?

Deathcry
unrevealed

-bring back Sharra Neramani! It'd be so easy after Chaos War aftermath.

Ravonna a.k.a.
Ravonna Lexus Renslayer

-remind me what issue she went by "LEXUS"?

Here's a 'fun' alphabetical infographic list by somebody online that might get your nitpicking juices flowing:
https://i0.wp.com/img14.deviantart.net/4877/i/2015/113/7/4/the_avengers_hand_drawn_characters_by_moviemaniacuk-d5rk680.jpg
http://fc00.deviantart.net/fs70/i/2013/015/2/0/the_avengers_hand_drawn_characters_by_moviemaniacuk-d5rk680.jpg

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I miss Dad & Dan.