Coast sits next to 4 phonetic neighbors — Cole, Colt, and Chase are the closest matches by sound. Most share Coast's English-origin cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"land bordering the sea"
"helmet of will, guardian"
"bold counsel, brave advisor"
"stream, small brook"
"slender and fair"
"village of the cross, farm by the cross"
"charming, wily"
"land of the Bronck family"
"west wind"
"broad valley"
"goodness of Yahweh"
"treasure, to store (possible Arabic root)"
"son of Carr, marshy land"
"panache, flair (as in 'cut a dash')"
"acquired, possessed"
"God has seen"
"the sound"
"open, beginning"
"territory of Owen"
"man from Hadria"
Similar sound: These names share phonetic patterns with Coast — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old French origins, giving them the same cultural heritage as Coast.
Rhythm: Coast is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.