ECC Key Sizes

I was playing around with Kleopatra and thinking of making an ECDSA.EdDSA + ECDH key. I noticed there were a few options of types ed25519, cv25519, and various brainpool and NIST ones.

I’m guessing (which could be incorrect) the numbers after the brainpool and NIST ones are key sizes?? If that is correct, what size keys do ed25519 and cv25519 use? Or am I just totally wrong about all of it?