Decklan sits next to 3 phonetic neighbors — Declan, Declin, and Decker are the closest matches by sound. Most share Decklan's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"man of prayer"
"triumph, conquest"
"love, passion"
"olive tree, peace"
"blessed"
"Short form of Uilliam, the Irish form of William"
"flowing river, running water"
"one who works the earth"
"praised, God will be praised"
"futility, vanity"
"God has heard (from Ja-/Jacob root) + spirit of battle (from Kayden)"
"goodness"
"bright-headed"
"born of the yew tree"
"beautiful and good"
"place name origin: a hundred in Cornwall, England"
"fortress, military camp"
"modern invention with Arabic suffix influence"
"noble ruler"
Similar sound: These names share phonetic patterns with Decklan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Irish origins, giving them the same cultural heritage as Decklan.
Rhythm: Decklan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.