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"
"leek farm village"
"angel of death"
"gift, wealthy possessor"
"who is like God"
"from the Egnatius family name"
"evening, twilight, the pleasant time of day"
"enlightenment, calm clarity"
"famous wolf"
"God will add, God will increase"
"people's power"
"long hill, ridge"
"strife"
"one who brews beer or ale"
"to run fast, a burst of speed"
"beloved of God"
"Yahweh has shown favor"
"descendant of Otto"
"throne of the eye (possible etymology)"
"divine might"
"sky father, divine sky"
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.