Cypher sits next to 4 phonetic neighbors — Cipher, Sifer, and Ryder are the closest matches by sound. Most share Cypher's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"zero, the concept of nothing"
"flow, great river"
"short form of Beckett (bee cottage)"
"volcanic black glass"
"slender warrior (Celtic phonetic elements)"
"worshiper of God"
"God is salvation"
"grandchild, descendant"
"arms (of God)"
"the greatest, most excellent"
"dark one, little dark one"
"diminutive of Hobart"
"river"
"guelder rose tree; handsome youth"
"land of Eoghan (Irish)"
"modern American invented name"
"descendant of Raghallach"
"rich in friends"
"Roman clan name Horatius (origin uncertain)"
"God will uplift"
"day"
Similar sound: These names share phonetic patterns with Cypher — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Arabic via Latin origins, giving them the same cultural heritage as Cypher.
Rhythm: Cypher is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.