Harlan sits next to 4 phonetic neighbors — Harlen, Harley, and Carlan are the closest matches by sound. Most share Harlan's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"rocky land, stony ground"
"visitor, pilgrim"
"stone worker (via Mason)"
"helper, one who helps"
"Yahweh is my flame"
"trained, experienced"
"son of Ridge"
"son of Cole"
"people's victory"
"wolf lover"
"drawn out of water"
"western clearing"
"free man"
"bringer of light"
"God's peace, divine peace"
"greatest of the Aemilians"
"famous land, renowned territory"
"modern coined name, son of Bray"
"right-handed, skillful"
"may God protect"
"from the roe deer land"
Similar sound: These names share phonetic patterns with Harlan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old English origins, giving them the same cultural heritage as Harlan.
Rhythm: Harlan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.