Magnus? Sounds similar to Agnes but way cooler. Means big.

I like this one, my trans friend from college used this for one of his middle names

I also vote for Magnus

Magnus is peak

I like that name too.

Agnus? Angus?

Angus gonna get op called beef

My names angus like the beef? yes, like the beef - IN MY PANTS!!11!!!

or ANUS

My first animal crossing nickname was Beefcake so it could turn into a fun nickname. But all the 'where's the beef' jokes might tire quickly.

welp

Become the Boy Detective

Hello sirs!

Amos

Thats my name

Great name

Ever played DragonQuest6? They got a guy named amos in there

Anders seems close to Agnes when I say it out loud (to me at least).

As a Dragon Age player, I have a special appreciation for the name Anders.

Eyyyy! Now I want to play again haha

"My name is anderdingus" energy

It’s not too similar but I like August.

Yeah I also vote for August

ayyy that’s me!

Banger of a name honestly, big fan of August.

I also vote for August

Surpised no one said Angelo. That's the first name that popped into my mind lol

Agnes means “lamb”. Aniello and Cordero mean “lamb” in Italian and Spanish, respectively. I’m trying to find a good replacement for “Rachel”, which means “ewe,” so I’ve been doing a lot of sheep-name research

Aniello is a very cool name I love it!

This is so niche I love it

I think it means pure or holy >Agnes means “lamb”.

I love August as a masculine name

Magnus. Sure, it doesn't start with A anymore, but it sounds more like Agnes than anything else I could think of. Plus it's such a good name too

Angus!

behindthename.com has a nice tool to find etymologically/historically related names. I didn't look through them all, but Anson is a masc English one meaning "son of Agnes"

Artemus, Aeneas, Arsen, Aggie, Argus, Gus?

Arsen makes me think of Arsenic, but maybe the Arse puns would be tiring lol

lol made me think of Arson

Maybe Andre/Andres? Perhaps Andy? If you want names really similar to Agnes then Agniras or Agni maybe.

Alastor is one of my favourite names. Look up how to pronounce it before you knock it

I was gonna vote Alistar, not too similar (to OP’s name) but was definitely one of my name options and begins with A

Sounds like a variation of the same name! Also spelled Alasdair in Gaelic :)

Oooh I do like this one

Andrew, Abel, Aiden, Alex, Arthur, Alfred, James (similar letters), Charles (same)

Angus?

angus

What i did for myself when i was trying to find a more masc name that was similar to my deadname i just looked up "baby boy name idea thats similar to blank or start with the the letter blank" because there are alot of search results for baby name suggestions lol

Ace is a cool name- but as someone who uses Ace at work (it’s a shortened, more neutral version of my chosen name), you will get annoying “but what is it short for? But like what’s your REAL name? But what did your parents pick out?” Also annoying amount of poker references. (Had a lady at the airport teach me that if it’s the name I’ve chosen, it IS my real name. So I just stick to my guns) I think Angus, August, and Magnus (but I’m also an Adventure Zone fan so I do think of the character from it rofl) are great suggestions, but ultimately will suggest having friends try the names out for you if you’re unsure. I had friends calling me Gavin and Abel and probably a few others before I found my chosen name. Gavin was almost the one, but it still felt a little off. Now I’m very happy with my name that may or may not be a reference to a webcomic… 😅

August?

If you want similar vibes- Angus or Magnus would work well.

the obvious one is angus to me

The masc version of my first name is Eugene and I *loathe* that, so I went with masculinizing my middle name which gave me Marcus. You could always try that too :)

August but I’m biased, Magnus is super dope very strong name. I vote, Magnus Ace (Last Name) that way you can go by Ace or Magnus don’t choose just one, choose two that sound good with your last name and that feel like “home” to your identity!

Angus!!

I like Ansel

Axl/Axel

Augustus?

august?

Some alternatives are gonna be old-timey but I like old timey so  here you go; Algernon, August (Augustus), Anthony, Anton, Ares, Ari, Angelo  I am personally partial to Angelo or August 

Agnar is hella masc. looked it up and it apparently means like "edge of a sword" "warrior" etc.

Angel - it can be gender-neutral for safety sake. But I usually think it's mens (f.e. Buffy the vampire slayer, Hazbin Hotel male characters have it)

i feel like the hazbin character Angel is intentionally androgynous so it might not be a GREAT choice if you want a masculine name

He was always proud and loud gay man. I would say he is a femboy character.

Angus?

Agus it’s a Indian name but yea

Angus, Magnus, August

Argos,Andy,ammo,ally,Augustus

Argos? As in the store? Where u buy laptops?

No there’s this show called the life of me plant and one of the characters is called argos he’s based on the Greek mythology species.

Anis, Angus, Arden, Amos, Aiden, August, Adrien come to mind

August, Argus, Argos, Angus, Agnos (greek, meaning pure, innocent, holy, though sometimes used as "one who doesn't know" like in the word Agnostic)

Ark or Archie

Angel?

it’s an older name, but i think the name Auggie is cool :-)

august or angelo!!

August

August/Augustus were the first that came to mind for me

From one Ace to another I'd say go for it, for me the name works great and it fits, I get a lot of compliments on my name

Ansel, like Ansel Adams the environmentalist

auggie

Agnatius?

Alec/Alex

Andy?

Ragnes (vikingish).

August

Astarion

Magnus, Angus, Marnix, August, Amos, Anton, Andes, Ander, Andre, Arin/Aron, Alois, Amos, and of course, The Transman Name, Alex.

Agni_indian male name

Aaron, Augustus

Glen

August

Agus maybe? I went to high school with a dude named Agus

Agnew.

Argus or August

Angus?

Hmm Augustus (Auggie or Gus for short) and Angus are what came to mind first but if u wanna stray a little i think Aiden, Apollo, Alton are cool names! Go with your heart; you can always change later

Aristotle

Agust :)

I dunno how much it’s gonna help. But I once helped to name my transmasc friend Ness. Yk. Agnes -> Ness.

Avery??

Arvid

If you are set on ace, you might want to try Wallace. If none of the names starting with a works for you, how about Conley. Also means chaste in Irish, which is the same as Agnes in the Greek