Rika sits next to 4 phonetic neighbors — Rica, Erika, and Rika are the closest matches by sound. Most share Rika's Japanese cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"pear blossom (梨花)"
"famous warrior"
"famous, bright warrior"
"inheritance, lot, portion"
"blooming, goddess of flowers"
"God is gracious"
"forest spirit"
"gift of God"
"spring-born, of the spring season"
"merriment, joyful laughter"
Similar sound: These names share phonetic patterns with Rika — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Japanese origins, giving them the same cultural heritage as Rika.
Rhythm: Rika is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.