Kelvin sits next to 3 phonetic neighbors — Kevin, Melvin, and Gavin are the closest matches by sound. Most share Kelvin's Scottish cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"from the River Kelvin, narrow river"
"staff of the Goths"
"of noble renown"
"spiritually reborn through baptism"
"wealthy gift"
"Frenchman, man from France"
"son of Cole"
"chief, lord"
"from the fen, marshland dweller"
"shield wolf, protector"
"son of the right hand"
"noisy disturbance, civil commotion"
"salmon"
"dedicated to Mars"
"powerful spearman"
"valley of the River Kent"
"land bordering the sea"
"rock, stone"
"of Mars, warlike"
"man of power on the hill"
"ancient, enduring"
Similar sound: These names share phonetic patterns with Kelvin — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Brythonic Celtic origins, giving them the same cultural heritage as Kelvin.
Rhythm: Kelvin is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.