Ac sits next to 4 phonetic neighbors — Ace, Casey, and AC are the closest matches by sound. Most share Ac's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"initials: various combinations (Andrew Charles, Anthony Cole, etc.)"
"to throw overboard, to cast away"
"divinely favored"
"birch tree clearing"
"farm by the fen"
"God is my oath"
"one who farms the land"
"Dealer in cloth and fabrics, cloth merchant"
"beloved darling"
"undulating; like a wave"
"hawk-like; stately"
"weapon, mace bearer"
Similar sound: These names share phonetic patterns with Ac — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have American English origins, giving them the same cultural heritage as Ac.
Rhythm: Ac is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.