Deklan sits next to 3 phonetic neighbors — Declan, Dylan, and Deck are the closest matches by sound. Most share Deklan's Irish-rooted cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"man of prayer"
"green/fresh river"
"YHWH saves"
"peaceful ruler"
"priceless one, beyond praise"
"invented blend of Jared and Gareth"
"lion"
"famous spear (from Hrodgar)"
"defender of the people"
"descendant of the fair one"
"dear, gracious, beloved"
"marsh dweller"
"huckleberry berry plant"
"boar-friend, warrior companion"
"invented name; light or replica"
"member of the Kru seafaring people (West Africa)"
"son of Evan"
"the carved one (alternate etymology)"
"rapid water"
"from the high woodland clearing"
"protector of men"
Similar sound: These names share phonetic patterns with Deklan — 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 Deklan.
Rhythm: Deklan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.