Jiraiya sits next to 3 phonetic neighbors — Giraiya, Jiraya, and Hiraya 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"
"open grassy land"
"Yahweh has created"
"priceless one"
"to rejoice, joyful"
"one from the British Isles"
"supplanter, one who follows"
"gift of God, gift of Yahweh"
"son of James"
"from Mauritania"
"one who works a lathe, craftsman"
"song, singing bird"
"most merciful, most compassionate"
"the twin"
"three, the third"
"strong, vigorous second son"
"strong warrior"
"constant, faithful"
"the twin"
"short form of Benedict: blessed"
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.