Concepcion sits next to 3 phonetic neighbors — Conception, Connie, and Cepción are the closest matches by sound. Most share Concepcion's Spanish-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"immaculate conception"
"The heavens or celestial"
"mine, belonging to me"
"noble, distinguished, illustrious"
"daughter of the wave or flood"
"enclosed garden"
"famous, renowned (via Lydia)"
"courageous, spirited"
"southern land"
"son of the noble one"
"Initial name (letter D)"
"a jewel-bright, exotic feminine name"
"father's delight"
Similar sound: These names share phonetic patterns with Concepcion — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Spanish/Latin origins, giving them the same cultural heritage as Concepcion.
Rhythm: Concepcion is a 4-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.