Flavel sits next to 4 phonetic neighbors — Gravel, Travel, and Pavel are the closest matches by sound. Most share Flavel's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"yellow-haired, golden"
"prudent, wise, showing good judgment"
"kingly"
"the day (personified deity)"
"Christ-carrier"
"divine law, path to the watering hole"
"From Meirionnydd; of the Welsh coastal region"
"lion-hearted"
"powerful counsel"
"from the hill settlement, dweller by the downs"
Similar sound: These names share phonetic patterns with Flavel — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin origins, giving them the same cultural heritage as Flavel.
Rhythm: Flavel is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.