Jiraiya sits next to 4 phonetic neighbors — Jiraya, Jariya, and Mariya are the closest matches by sound. Most share Jiraiya's Japanese cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"young thunder, child of thunder"
"whole, universal"
"law, rule, model conduct"
"I rejoice in wealth (short form)"
"of the Kushan people"
"knowledge obtained by investigation"
"reason and clothing"
"syllabic script, graceful"
"now go"
"good art, excellent performance"
"snow flower child"
"joyful child"
Similar sound: These names share phonetic patterns with Jiraiya — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Japanese origins, giving them the same cultural heritage as Jiraiya.
Rhythm: Jiraiya is a 4-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.