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"
"lion (leonem)"
"one who transports goods by cart"
"divine gift"
"from Sebastia"
"teacher, messenger"
"gravelly homestead"
"the one to whom it belongs"
"gift of God"
"may God strengthen"
"phonetic creation, no traditional meaning"
"rowan tree (red-berried tree)"
"born on Sunday"
"house builder, craftsman"
"son of Stephen, crown bearer"
"bear-king, bear-man"
"dear one of God"
"greatest, largest"
"God will raise up"
"at the ash tree"
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.