Arch sits next to 3 phonetic neighbors — Archer, Arch, and March are the closest matches by sound. Most share Arch's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"truly brave, genuinely bold"
"God establishes"
"descendant of the champion"
"little king"
"victory of the people (as short form of Nicholas)"
"evergreen juniper tree"
"good valley"
"parched land, sun-baked land"
"heavenly, royal, exalted"
"place of the birch trees"
"great (via Chinese Quan)"
"growth, abundance, increase"
"beginning, origin, creation"
"cause of death, ruin, poison"
"God waits, hope in God"
"strong fighter (from bar + hard)"
"divine, holy"
"bear"
"of Sean"
"the smallest unit of matter"
"champion, winner"
Similar sound: These names share phonetic patterns with Arch — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Germanic origins, giving them the same cultural heritage as Arch.
Rhythm: Arch is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.