I’i trying to compile a list of girls name that relate to the season and/or the months to be potential middle names (I have a real love of these names, and also the meanings that birth months/seasons have).
So which names do you think of for spring, summer, autumn and winter? And what about each of the months?
Thank you for your input 
Apart from the obvious month/season word names, I associate mainly nature names with the seasons:
[name_f]Spring[/name_f]
[name_f]Flora[/name_f]
[name_f]Iris[/name_f]
[name_f]Primrose[/name_f]
[name_f]Bluebell[/name_f]
[name_f]Lark[/name_f]
[name_u]Wren[/name_u]
[name_f]Blythe[/name_f]
[name_f]Nova[/name_f]
[name_f]Liv[/name_f]
[name_f]Dawn[/name_f]
[name_f]Lucy[/name_f]
[name_f]Ondine[/name_f]
[name_f]Fawn[/name_f]
[name_f]Summer[/name_f]
[name_f]Daisy[/name_f]
[name_u]Eden[/name_u]
[name_u]Skye[/name_u]
[name_f]Rose[/name_f]
[name_f]Sunniva[/name_f]
[name_m]Sol[/name_m]/[name_f]Soleil[/name_f]
[name_f]Sylvie[/name_f]
[name_f]Jasmine[/name_f]
[name_f]Eartha[/name_f]
[name_f]Gaia[/name_f]
[name_f]Fern[/name_f]
[name_f]Autumn[/name_f]
[name_f]Eve[/name_f]
[name_f]Honey[/name_f]
[name_f]Maple[/name_f]
[name_u]Arden[/name_u]
[name_u]Rain[/name_u]
[name_u]Ember[/name_u]
[name_f]Flavia[/name_f]
[name_f]Fiamma[/name_f]
[name_f]Willow[/name_f]
[name_f]Aura[/name_f]/[name_f]Aurelia[/name_f]
[name_f]Oriana[/name_f]
[name_f]Orla[/name_f]
[name_f]Fia[/name_f]
[name_u]Winter[/name_u]
[name_f]Holly[/name_f]
[name_f]Ivy[/name_f]
[name_f]Noelle[/name_f]
[name_f]Hosanna[/name_f]
[name_f]Snow[/name_f]
[name_f]Alba[/name_f]
[name_f]Isolde[/name_f]
[name_f]Fritha[/name_f]
[name_f]Carol[/name_f]
[name_f]Robyn[/name_f]
[name_f]Jovie[/name_f]
[name_f]Mary[/name_f]
[name_f]Elvie[/name_f]
[name_f]Aurora[/name_f]
[name_f]Lyra[/name_f]
[name_f]Zuzu[/name_f]
[name_f]Spring[/name_f]
[name_f]Hazel[/name_f] - hazel tree
[name_f]Aviva[/name_f] - springlike, fresh, dewy
[name_f]Chloe[/name_f] - young green shoot/blooming
[name_u]Vivian[/name_u] - life
[name_f]Summer[/name_f]
[name_f]Kalinda[/name_f] - sun
[name_f]Marina[/name_f] - sea
[name_f]Elena[/name_f] - bright, shining light
[name_f]Meadow[/name_f] - nature name
Fall
[name_f]Autumn[/name_f] - obviously 
[name_f]Amber[/name_f] - color name
[name_f]Theresa[/name_f] - to harvest
[name_f]Zendaya[/name_f] - to give thanks
[name_u]Winter[/name_u]
[name_u]Yuki[/name_u] - snow
[name_f]Selena[/name_f] - moon goddess
[name_f]Bianca[/name_f] - white
[name_u]Juniper[/name_u] - coniferous plant
Great list @katinka! I would add…
[name_f]Lumi[/name_f] (means snow)
[name_f]Autumn[/name_f]
[name_u]Winter[/name_u]:
[name_u]Winter[/name_u]/[name_u]Wynter[/name_u]
[name_u]Noel[/name_u]
[name_f]Noelle[/name_f]
[name_f]Carol[/name_f]
[name_f]Eve[/name_f]
[name_f]Holly[/name_f]
[name_f]Natalie[/name_f]/[name_f]Natalia[/name_f]
[name_f]Snow[/name_f]
[name_u]January[/name_u]
[name_f]Eira[/name_f]
[name_u]Aspen[/name_u]
[name_m]Christian[/name_m]
[name_f]Christine[/name_f]/[name_u]Christy[/name_u]/[name_f]Chrissie[/name_f]/[name_f]Chrissy[/name_f]
[name_f]Alaska[/name_f]
[name_f]Neve[/name_f]
[name_f]Neva[/name_f]
[name_f]Elsa[/name_f]
[name_f]Ivy[/name_f]
[name_f]Bianca[/name_f]
[name_f]Blanche[/name_f]
[name_f]Merry[/name_f]
[name_f]Mary[/name_f]
[name_f]Maria[/name_f]
[name_f]Garnet[/name_f]
[name_f]Amethyst[/name_f]
[name_f]Natasha[/name_f]
[name_f]Aster[/name_f]
[name_f]Estelle[/name_f]/[name_f]Estella[/name_f]
[name_f]Stella[/name_f]
[name_f]Star[/name_f]/[name_f]Starr[/name_f]
[name_u]Seren[/name_u]
[name_f]Winnie[/name_f]
[name_f]Wendy[/name_f]
[name_u]Robin[/name_u]/[name_f]Robyn[/name_f]
[name_f]Lumi[/name_f]
[name_f]Crystal[/name_f]/[name_f]Krystal[/name_f]
[name_f]Gabrielle[/name_f]
[name_f]Gwendolyn[/name_f]
[name_f]Gwenyth[/name_f]/[name_f]Gwyneth[/name_f]
[name_u]Ember[/name_u]
[name_u]Angel[/name_u]
[name_f]Clara[/name_f] - The Nutcracker reference
[name_f]Gloria[/name_f]
[name_f]Hazel[/name_f]
[name_u]Nevada[/name_u]
[name_f]Belle[/name_f]
[name_u]Clove[/name_u]
[name_f]Coco[/name_f]
[name_f]Joy[/name_f]
[name_f]Lovely[/name_f] suggestions so far. As far as month names go, I would suggest birthstones! Of course some of them are more common or more usable then others.
[name_u]January[/name_u]: [name_f]Garnet[/name_f]
[name_f]February[/name_f]: [name_f]Amethyst[/name_f]
[name_u]March[/name_u]: Aquamarine
[name_f]April[/name_f]: [name_f]Diamond[/name_f]
[name_f]May[/name_f]: [name_f]Emerald[/name_f]
[name_u]June[/name_u]: [name_f]Pearl[/name_f] or Alexandrite
[name_u]July[/name_u]: [name_u]Ruby[/name_u]
[name_u]August[/name_u]: [name_f]Peridot[/name_f]
[name_f]September[/name_f]: [name_f]Sapphire[/name_f]
[name_f]October[/name_f]: Tourmaline or [name_f]Opal[/name_f]
[name_u]November[/name_u]: [name_f]Topaz[/name_f] or Citrine
[name_u]December[/name_u]: Tanzanite, Zircon or [name_f]Turquoise[/name_f]
I love the name [name_f]Solstice[/name_f] for a summer/winter baby because a solstice occurs twice a year, around [name_u]June[/name_u] and [name_u]December[/name_u]
[name_f]Spring[/name_f]:
[name_f]Easter[/name_f]
[name_f]Chava[/name_f]
[name_u]Demeter[/name_u]
[name_u]Rain[/name_u]
Mayrah
[name_u]Newlyn[/name_u]
[name_f]Valley[/name_f]
[name_f]Ceres[/name_f]
Vasanti
Avriel
[name_f]Petal[/name_f]
[name_f]Laverne[/name_f]
Gwanwyn
[name_f]Primavera[/name_f]
[name_f]Clover[/name_f]
[name_f]Gen[/name_f]
Lennor
[name_f]Meadow[/name_f]
Jarmila
Valmai
[name_u]Brooke[/name_u]
Feronia
[name_f]Midori[/name_f]
Eranthe
Cloria
[name_m]Viridian[/name_m]
Anew
[name_f]Summer[/name_f]:
Suma
[name_m]Palmer[/name_m]
[name_u]Haley[/name_u]
Shine
[name_f]Laguna[/name_f]
[name_f]Coral[/name_f]
[name_f]Solange[/name_f]
Udara
[name_u]Waverly[/name_u]
[name_f]Sunday[/name_f]
[name_f]Margarita[/name_f]
Shelsea
Hafwen
[name_f]Breeze[/name_f]
Citrine
Ocea
[name_f]Isla[/name_f]
[name_u]Sandy[/name_u]
[name_f]Autumn[/name_f]:
[name_f]Jora[/name_f]
[name_f]Olive[/name_f]
[name_f]Trixie[/name_f]
[name_u]Clove[/name_u]
[name_f]Arlet[/name_f]
[name_f]Fauna[/name_f]
[name_f]Demetria[/name_f]
[name_u]Rowan[/name_u]
Ochre
[name_f]Maizie[/name_f]
Halowen
[name_f]Arista[/name_f]
[name_u]Raven[/name_u]
Cornucopia
Falla
[name_u]Roux[/name_u]
[name_f]Octavia[/name_f]
Harvest
Cider
[name_u]Winter[/name_u]:
Yepa
[name_f]Brandy[/name_f]
[name_f]Myrtle[/name_f]
[name_f]Hannah[/name_f]
[name_f]Anneka[/name_f]
[name_f]Valentina[/name_f]
[name_f]Nicole[/name_f]
[name_f]Mercy[/name_f]
[name_u]Felice[/name_u]
Eirwen
[name_u]Cedar[/name_u]
Conifer
[name_f]Trinity[/name_f]
[name_f]Bethel[/name_f]
[name_f]Plum[/name_f]
[name_u]Joyce[/name_u]
[name_f]Merry[/name_f]
[name_u]Peace[/name_u]
[name_m]Coal[/name_m]
[name_u]North[/name_u]
[name_f]Velvet[/name_f]
[name_u]Dove[/name_u]
Poinsettia
Ice
Bells
[name_f]Holiday[/name_f]