Keith sits next to 3 phonetic neighbors — Keats, Heath, and Reef are the closest matches by sound. Most share Keith's Scottish cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"wood, forest"
"cloud"
"divine judge"
"dark blue water"
"flower (from Greek anthos)"
"son of the wealthy guardian"
"handsome, cheerful"
"dark-haired, tawny"
"whole, universal, powerful"
"God is gracious (via John)"
"oarsman"
"son of the right hand"
"prince's town"
"warrior"
"stone clearing, rocky glade"
"the one who saves"
"dark settlement"
"open grassy land"
"ruler, sovereign (from Julius Caesar's name)"
"loyal"
"first zodiac sign, new beginnings"
Similar sound: These names share phonetic patterns with Keith — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Celtic origins, giving them the same cultural heritage as Keith.
Rhythm: Keith is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.