Furious sits next to 4 phonetic neighbors — Julius, Darius, and Fabius are the closest matches by sound. Most share Furious's Latin-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"full of fury, fierce, passionate"
"Supplanter; holder of the heel"
"the fifth"
"otter"
"God is gracious"
"flowing down, descending (Jordan River)"
Similar sound: These names share phonetic patterns with Furious — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Furious.
Rhythm: Furious is a 3-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.