Eureka sits next to 4 phonetic neighbors — Erica, Ericka, and Eurydice are the closest matches by sound. Most share Eureka's Greek-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"I have found it"
"Noble, honorable"
"bear, strong"
"noble, well-born"
"bliss, good fortune"
"goddess, divine female"
"name of God"
"lives near the cliff, from the ford by the cliff"
"horse lord"
"the letter V, symbolizing victory"
"life, living and breathing"
"latticed garden framework, support structure for climbing plants"
Similar sound: These names share phonetic patterns with Eureka — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Greek origins, giving them the same cultural heritage as Eureka.
Rhythm: Eureka is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.