Cooper sits next to 3 phonetic neighbors — Harper, Hooper, and Jasper are the closest matches by sound. Most share Cooper's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"barrel maker, cask maker"
"modern feminine form of Tyler"
"graceful, heavenly one"
"fragrant flower, gift from God (Persian tradition)"
"descendant of the dark challenger"
"child of the earth"
"heaven, sky"
"bright, shining one"
"to hold dear, to treasure"
"noble one by the lake"
"to carry, to endure"
"faithfulness, devotion, allegiance"
"torch, light"
"twinflower (Linnaea borealis)"
"star of the sea, beautiful"
"unique beauty (possible Zulu-influenced)"
"light, bright, shining"
"expert, connoisseur"
"modern invented name"
"a falling, a flowing"
"otherworldly paradise"
Similar sound: These names share phonetic patterns with Cooper — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Middle English origins, giving them the same cultural heritage as Cooper.
Rhythm: Cooper is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.