No, I don't like it.
Gray plus a random trendy sound makes a trendy name. Doesn't even sound feminine.
But if you want middle names:
Graylen
KaiaGraylen
Neve /
NiamhGraylen
SophiaGraylen
ScholasticaGraylen
CharlotteGraylen
IsobelGraylen
LucieGraylen
AliciaGraylen
MariGraylen
AeronaGraylen
PariGraylen
PrimroseGraylen Morning
Graylen
SakuraGraylen
MaeveGraylen
Diana