Cliff sits next to 4 phonetic neighbors — Clift, Griff, and Biff are the closest matches by sound. Most share Cliff's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"steep rock face by a crossing"
"youth-producing"
"God strengthens, Yahweh strengthens"
"homeland person"
"strife, contest"
"red warrior, son of the red warrior"
"diminutive of Hugh (heart, mind)"
"well-born, of noble birth"
"glorious protector (as diminutive of Branislav)"
"speckled, or from the bridge settlement"
"brave warrior"
"lion"
"from Stockton"
"oak grove"
"calm, depth, trust"
"of the Caspian Sea"
"adult male deer, stag"
"all-knowing, wise"
"garden of hollies, holly garden"
"payment, brow, forehead"
"of royal lineage, kingly"
Similar sound: These names share phonetic patterns with Cliff — 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 Cliff.
Rhythm: Cliff is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.