Beckett sits next to 5 phonetic neighbors — Bennett, Everett, and Bridget 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
"dweller by the brook"
"brave, valiant (from Ry- element)"
"lapis lazuli blue"
"wave"
"one who builds with stone"
"star sun"
"heavenly, celestial"
"sequence of musical notes"
"heavens and flowing water"
"descendant of Raghallach"
"feminine form of John"
"paradise, heavenly bliss"
"dark-complexioned, dark beauty"
"Jewish woman (via Judith/Yehudit)"
"reddish-brown color, warmth"
"from Gilan region, noble"
"rye meadow, island clearing"
"of the Tatius family"
"lake, waterfall"
"conch shell"
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.