Keir sits next to 5 phonetic neighbors — Kier, Kiir, and Ciarán are the closest matches by sound. Most share Keir's Scottish cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"dark one, dark-complexioned"
"Maker of barrels and casks"
"resolute protector, determined guardian"
"God is gracious"
"God has remembered"
"from Renton, town name"
"immortal, divine"
"resembling the bright one"
"descendant of Cathasach"
"A dark image or form following a person or object"
"from the gray hill"
"little wolf"
"son of the wave, born of the sea"
"ancient, enduring"
"bought land, purchased territory"
"invented modern name"
"westward direction"
"from the southern lands"
"wealthy protector"
"landholder, lord"
Similar sound: These names share phonetic patterns with Keir — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Scottish Gaelic ciar origins, giving them the same cultural heritage as Keir.
Rhythm: Keir is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.