I am looking for a boy and girls name that fits in with the girls names, [name_u]Winter[/name_u] and [name_f]Sunday[/name_f]. [name_u]Winter[/name_u] would go by [name_f]Winnie[/name_f] and [name_f]Sunday[/name_f] would go by [name_u]Sunny[/name_u].
[name_f]Clementine[/name_f] is the first name that came to my mind.
[name_u]Juniper[/name_u]
[name_u]Arden[/name_u]
[name_f]Scarlett[/name_f]
[name_u]Harper[/name_u]
[name_u]Haven[/name_u]
[name_u]Eden[/name_u]
[name_f]Willow[/name_f]
[name_f]Nova[/name_f]
[name_u]Larkin[/name_u]
[name_f]Hazel[/name_f]
[name_u]June[/name_u]
[name_f]Luna[/name_f]
[name_f]Maple[/name_f]
[name_u]Wren[/name_u]
[name_f]Rosemary[/name_f]
[name_f]Magnolia[/name_f]
[name_f]Ivy[/name_f]
[name_f]Iris[/name_f]
[name_u]Ruby[/name_u]
[name_f]Violet[/name_f]
[name_f]Belle[/name_f]
[name_u]Winter[/name_u], [name_f]Sunday[/name_f], and -
[name_f]Violet[/name_f] “[name_f]Lettie[/name_f]”
[name_f]Coralie[/name_f]
[name_f]Coraline[/name_f] “[name_f]Cora[/name_f]”, “[name_f]Coralie[/name_f]”
[name_f]Hazel[/name_f]
[name_f]Clementine[/name_f]
[name_f]Sunday[/name_f], nn. [name_u]Sunny[/name_u] is one of my gp’s 
With [name_u]Winter[/name_u] and [name_f]Sunday[/name_f] I think you need something ‘wordy’ or nature related. What about:
[name_m]Brooks[/name_m]
[name_u]River[/name_u]
[name_f]Marina[/name_f]
[name_f]Oceane[/name_f]
[name_m]Rainer[/name_m]
[name_f]Reina[/name_f]/[name_f]Raina[/name_f]
[name_m]Atlas[/name_m]
[name_f]Whimsy[/name_f]
[name_u]Ember[/name_u]
[name_u]Blaise[/name_u]
[name_f]Autumn[/name_f]
[name_f]Poesy[/name_f]/[name_f]Posey[/name_f]
[name_f]Blossom[/name_f]
[name_u]Story[/name_u]
[name_f]Poet[/name_f]
[name_f]Briar[/name_f]
[name_u]Juniper[/name_u]
[name_u]Sage[/name_u]
[name_u]Rowan[/name_u]
[name_f]Willow[/name_f]
[name_u]Sorrel[/name_u]
[name_f]May[/name_f]
[name_u]June[/name_u]
[name_f]April[/name_f]
[name_u]August[/name_u]
[name_f]Aurora[/name_f]
[name_u]Raven[/name_u]
I forgot boys
[name_m]Forrest[/name_m]
[name_m]Fletcher[/name_m]
[name_m]Gage[/name_m]
[name_u]Rowan[/name_u]
[name_u]Sawyer[/name_u]
[name_m]Atlas[/name_m]
[name_m]Archer[/name_m]
[name_u]North[/name_u]
[name_m]Greyson[/name_m]
[name_m]Graham[/name_m]
[name_m]Shepherd[/name_m]
[name_m]Jasper[/name_m]
[name_u]Calder[/name_u]
[name_u]Dexter[/name_u]
[name_m]Ford[/name_m]
[name_m]Heath[/name_m]
[name_m]Hugh[/name_m]
[name_f]Fern[/name_f]
[name_u]Wren[/name_u]
[name_u]Ever[/name_u]/ly
[name_u]Paisley[/name_u]
[name_f]Nora[/name_f]
[name_f]Indigo[/name_f] is the first thing that came to mind.
Also [name_f]Clover[/name_f], [name_f]Crimson[/name_f], [name_u]Dove[/name_u], [name_u]Juniper[/name_u], [name_f]Lark[/name_f], [name_f]Nova[/name_f], [name_u]Raven[/name_u], [name_f]Sapphire[/name_f], [name_f]Saffron[/name_f], [name_f]Poet[/name_f].
For boys I’d say…
[name_u]Flynn[/name_u], [name_m]Jett[/name_m], [name_u]River[/name_u], [name_m]Bowen[/name_m], [name_m]Calloway[/name_m], [name_u]Sutton[/name_u].