Raiden sits next to 4 phonetic neighbors — Ryden, Aiden, and Hayden are the closest matches by sound. Most share Raiden's Japanese cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"thunder and lightning"
"wise, wise storehouse"
"keeper of the pantry"
"sea, ocean (kai component)"
"son of Andrew (manly)"
"strength, force"
"wisdom, good sense"
"Christmas, born on Christmas"
"warrior, brave one"
"God has given"
"God is gracious (via John → Jack)"
"enduring, lasting"
"light of heaven"
"little fawn"
"crown, wreath"
"counsel's guardian"
"servant, messenger"
"young dog, whelp"
"speckled, freckled"
"Poecc's estate; Poecc's settlement"
"crow, dark bird"
Similar sound: These names share phonetic patterns with Raiden — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Japanese origins, giving them the same cultural heritage as Raiden.
Rhythm: Raiden is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.