Erica sits next to 4 phonetic neighbors — Erika, Erica, and Ericka are the closest matches by sound. Most share Erica's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"eternal ruler, ever-powerful"
"life"
"white, blessed + elm tree (hybrid)"
"sun gift (Sunniva variant)"
"harmony of sounds, consonance"
"sacred shrine, palace"
"from Massy (Norman town)"
"of the flowering camellia shrub"
"morning star, Venus"
"symbol of purity, virtue, and immortality"
"place of the bold ones"
"beloved (short form of Mary)"
"sacred scripture"
"violent weather, tempest"
"God is gracious (Jane)"
"modern invented name"
"rose and lake"
"my God is an oath"
"Jay + lake (modern coinage)"
"from India; the Indus River"
"lily flower"
Similar sound: These names share phonetic patterns with Erica — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Norse origins, giving them the same cultural heritage as Erica.
Rhythm: Erica is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.