These aren’t all unique. I just copied over from my list.
Alaska, Allegra, Alouette, Alpine, Amber, Amethyst, Amity, Andorra, Andromeda, Anova, Apple, April, Aria, Arrow, Aura, Avon, Azalea, Azula
Basil, Blue, Britain
Canary, Caspian, Cedar, Charity, Cherish, Clarity, Clearwater, Cloud, Coast, Colt, Cove, Crane, Creativity, Curiosity, Cyan
Dakota, Denali, Denver, Dragon/Long(Chinese and Vietnamese)/Ryu(Japanese), Dream, Driftwood
Eagle, Esmeralda/Emerald, Everest
Fable, Falcon, Fawn, Fern, Firefly, Forest, Fox, Frost
Galaxy, Gem, Granite
Hazel, Hero
Indigo, Ireland, Iris, Israel, Ivory, Ivy
Jade, Jasmine, Jewel, Juniper
Kiana
Lachlan, Lake, Lancaster, Lark/Larkspur, Lavendar, Lily, London, Lotus, Luna, Lunaria (flower), Lupine, Lion/Lyon, Lynx, Lyra
Magenta, Magnolia/Mulan, Maple, Meadow, Medina, Melody, Mink, Mountain
Newt, Ngoc (Gem or Jewel in Vietnamese), Nightingale, Novel
Oakwood, Odessa, Odessy, Olive, Onyx, Opal, Opportunity, Orchard, Orchid/LanLan (Chinese), Oregon, Orion, Otter
Paprika, Paris, Pepper, Peace/Ping/Aman, Pearl, Pendant, Peregrine, Persia, Pine, Phoenix/Phuong (Vietnamese), Poppy, Prarie
Rain, Raven, Redwood, River, Rosewood, Robin
Saponaria (flower), Saphira/Saphire, Savannah, Scaevola (flower), Scarlett, Sequoya, Sephora, Serenity, Shan (mountain in Chinese), Sierra, Silver, Sirius, Sky, Skye, Snapdragon, Snow, Sonata, Song, Sororia (flower), Sparrow, Spirit, Stone, Swan, Sycamour
Topaz, Thorn, Treasure, Tundra
Unity
Verona, Viola, Violet
Whitewater, Wildfire, Wildrose, Willow, Winter, Wisdom, Wolf/Wolfe/Wolfsbane/Wolfrum, Woodland, Wren
Yen (a bird in Vietnamese), Yue (moon in Chinese), Yukon
Zirconia
Names of planets and other astronomy objects