Riddick sits next to 3 phonetic neighbors — Rick, Derrick, and Hendrick are the closest matches by sound. Most share Riddick's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"powerful ruler"
"immortal"
"a wonder, an omen"
"bright, splendid"
"roe deer wood"
"enclosed woodland"
"invented name; no fixed traditional meaning"
"claw, swift predator (via Talon)"
"young"
"little king, kingly"
"son of Lawrence"
"dark wood clearing"
"broad stone settlement"
"strong flow, powerful surge (river etymology)"
"speech, language, of God"
"glorious gift"
"forever, always + wind/fighter (Ey + vindr etymology)"
"from the lake"
"son of Stephen, one who wears the crown"
"drawn out of the water"
"invented modern name"
Similar sound: These names share phonetic patterns with Riddick — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old English origins, giving them the same cultural heritage as Riddick.
Rhythm: Riddick is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.