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"
"golden field"
"powerful, mighty"
"noble, of the valley"
"life, living essence"
"one who crosses"
"butterfly (via Vanessa)"
"wandering star, planet"
"fairy queen"
"gift from God (popular interpretation)"
"ivory, white and precious"
"little son, dear boy"
"to live long"
"bird, life-breath"
"white phantom"
"bright, shining one"
"gracious, beautiful"
"peaceful, tranquil"
"life (from Zoe) with feminine diminutive"
"origin, beginning, creation"
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.