Rock sits next to 3 phonetic neighbors — Roc, Ruck, and Brock are the closest matches by sound. Most share Rock's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"stone, solid mass"
"swift as a deer"
"from the village of Estry in Normandy, France"
"firebrand, burning stick"
"invented: jay bird + fair (vin)"
"mind, intellect, spirit"
"first, beginning"
"counsel wolf"
"traveler, crossroads"
"wood, timber"
"spear warrior"
"regal and precious"
"noble protector"
"to hang, weigh, measure"
"To set down in writing; an account preserved in writing"
"settlement among the undergrowth, brushwood farm"
"God is gracious (via Sean)"
"Derived from Alfred, meaning counsel of elves"
"falcon, bird of prey"
"from the heath, heathen land"
"Creative African American name; strong and distinctive"
Similar sound: These names share phonetic patterns with Rock — 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 Rock.
Rhythm: Rock is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.