Want a lower-entropy keypair where your address starts with your name?
Tell the vanity address generator what you'd like your address to start with and it'll generate ed25519 keypairs until it finds a match.
Writes to /tmp/pk and /tmp/sk

Use at your own peril; a keypair whose public key starts with your name will have less entropy than a uniformly random keypair.

In other words, using this for anything important is probably a bad idea.

Dependencies: libbsd. Alternatively, if you don't want to install libbsd, you can edit random.c and replace arc4random_buf with whatever function your platform has for getting entropy.