Leelan sits next to 4 phonetic neighbors — Declan, Nolan, and Leland are the closest matches by sound. Most share Leelan's Old English (via Leland)-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"meadow land"
"A dark image or form following a person or object"
"champion, passionate one"
"lover of churches, church devotee"
"extended form of Zia"
"wise army, counsel-warrior"
"dawn, new beginning"
"little poet"
"holy settlement"
"deer; graceful one (indigenous interpretation)"
"ruler of the army"
"son of Cole (son of Nicholas)"
"dark-haired chieftain"
"resin, tree sap (unrelated etymology)"
"mercy, eternal"
"companion, friend (Old English origin)"
"elm tree grove"
"gift of YHWH"
"one of high authority, master"
"pledge, oath"
Similar sound: These names share phonetic patterns with Leelan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old English (via Leland) origins, giving them the same cultural heritage as Leelan.
Rhythm: Leelan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.