Harper sits next to 5 phonetic neighbors — Jasper, Parker, and Carter are the closest matches by sound. Most share Harper's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"harp player, one who plays the harp"
"dreamy obscurity"
"beauty, ornament"
"bright homestead, bright town"
"descendant of the fair one"
"wolf's shield"
"son of Kenneth / son of Coinneach"
"warrior, strong one (perceived meaning)"
"strong, healthy"
"son of Maurice"
"son of Dubhagan (little dark one)"
"dark-haired"
"grace, blessing"
"lion-hearted, brave"
"peace"
"crown, wreath"
"horseman, from the Cheviot hills"
"occupational surname for cellar manager"
"glory-power"
"little fire"
"fortified place, protection"
Similar sound: These names share phonetic patterns with Harper — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old English hearpere origins, giving them the same cultural heritage as Harper.
Rhythm: Harper is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.