I most certainly am open minded in the way of surname names and/or masculine names on girls. I wish I was brave enough to use them, as most are probably just gps for me!
I like [name_m]Grayson[/name_m] on a girl, though I prefer it spelt [name_f]Gracen[/name_f], or Graceyn. I know it looks awfully trendy, but I think it separates the boys name from the girls name. As you said, you have [name_f]Grace[/name_f] there as a girly option!
I cant picture [name_u]Easton[/name_u] on a girl though I see what you mean about [name_f]East[/name_f] being more feminine. For me, its the -ton that appears masculine.
Here are some suggestions;
[name_u]Lennon[/name_u], or [name_u]Lennox[/name_u] - with nickname [name_f]Leni[/name_f]/[name_m]Lenny[/name_m]
[name_u]Addison[/name_u] - [name_f]Addie[/name_f], [name_u]Sonny[/name_u]
[name_f]Kinley[/name_f]/[name_f]Kenley[/name_f]
[name_u]Everly[/name_u] - [name_f]Evie[/name_f], [name_f]Eva[/name_f], [name_u]Ever[/name_u]
[name_u]Hadley[/name_u]
[name_u]Monroe[/name_u]
[name_u]Sutton[/name_u]
[name_u]Tatum[/name_u]
[name_u]Elliot[/name_u] - [name_f]Ellie[/name_f], [name_f]Ella[/name_f], [name_f]Elle[/name_f]
[name_u]Tristen[/name_u]
I think, at the end of the day, as long as you pair it with a feminine middle name as you said, I think it will be fine!
I look forward to seeing more of your posts about