Pierce sits next to 4 phonetic neighbors — Piers, Pierce, and Reece are the closest matches by sound. Most share Pierce's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"rock, stone"
"pledge of peace"
"I believe (credo)"
"wholehearted (short for Caleb from Hebrew)"
"letter J, initial name"
"invented modern combination name"
"dark-haired, tawny"
"high, noble"
"young creature, cub"
"delight, luxury"
"greatest of the Aemilians"
"of the forest, wood-dweller"
"one who mills grain"
"right-handed, skillful"
"candle maker or seller"
"warrior's town"
"bowman, archer"
"God is gracious (via John → Jack)"
"great, venerable, majestic"
"trained, experienced"
"son of Nicholas (via Cole)"
Similar sound: These names share phonetic patterns with Pierce — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek via Latin origins, giving them the same cultural heritage as Pierce.
Rhythm: Pierce is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.