Grier sits next to 4 phonetic neighbors — Greer, Grayar, and Piper are the closest matches by sound. Most share Grier's Scottish cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"watchful, alert"
"magical letter, written symbol"
"youthful, child of the gods"
"the other Aenor (origin of Provençal form)"
"ray of light, dawn (implied by suffix)"
"shining, radiant"
"beloved, wished-for child"
"honorable, respectable"
"azalea flower (dry earth plant)"
"modern coinage, variant of Mackenzie"
"industrious, hardworking (associated meaning)"
"God's jewel, divine treasure"
"from Hadria (ancient Italian city)"
"beyond praise, highly commendable"
"worthy of love"
"strength, force"
"boomerang, returning stick"
"heavenly chief, ruler of the skies"
"Pearl (via Margarita, the Latin equivalent of Daisy)"
"lioness, brave as a lion"
"joyful poem"
Similar sound: These names share phonetic patterns with Grier — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Latin via Scottish origins, giving them the same cultural heritage as Grier.
Rhythm: Grier is a 1-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.