Beckett sits next to 3 phonetic neighbors — Bennett, Barrett, and Becket are the closest matches by sound. Most share Beckett's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"from the brook"
"sea, ocean"
"one who finishes cloth"
"warrior, brave one"
"twin, double"
"venerable, sacred"
"Yahweh is God"
"my God is Yahweh"
"whole-hearted, faithful"
"lord, master"
"deep valley; hollow valley"
"horseman, knight"
"my God is the Lord"
"Stone worker; one who builds with stone"
"strong as a boar"
"sorrowful (folk etymology via French)"
"merciful, gentle"
"small, humble"
"friendly, allies, friend"
Similar sound: These names share phonetic patterns with Beckett — 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 Beckett.
Rhythm: Beckett is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.