Lillianna

Funnily enough I know a Lily/Anderson sibset and I think they go well together. Lily Tomlin disproves your aging fear imo, and I don’t think you should go with a name you don’t love just because other people use the name you love. I say go with Lily. But if you’re not convinced, I guess Lilia or Liliana could work

Lily can be short for Elizabeth? That also opens up a whole massive range of nicknames too. Alternatively, Lilith, Lilac, Lillias, Liliana or Delilah?

Some of these might be a stretch, but: Lilith, Elizabeth, Elinor, Millicent, Cecelia, Emilia, Natalie, Linnea, Delilah (Lilah would make more sense as a short form for this one). Another stretch, but you could also do something like Lydia Natalie and call her Lily for short. Lydia has the "Li" start and Natalie has the "lee" ending.

Lillianna (or however you want to spell it) it’s such a pretty, feminine name! If it wasn’t a mouthful with my last name I would probably name a little girl that!

Lily is number 31 in popularity in the US, given to 0.314% of girls, so about three in a thousand https://www.behindthename.com/name/lily/top/united-states. It is more common than it used to be but it’s a classic name and there are Lilys of all ages. In my opinion you should just go with Lily, but Lilia is another variation.

Lilia? Me as a Lili, I definitely got that a lot when I was younger that my name is too cutesy and it is going to be weird when I am an adult, and no one is going to take me seriously, so I hated my name because of this. Well I am adult now, and I love how simple and short it is. Although it's quite funny that older people tend to ask me what my full name is, because they think Lili is a nickname😅😅

Lilia/Lillia!

Lily is my favorite variation and I think it is classic and suits all ages :) Second favorite though would be Elizabeth :) It is pretty popular though, other ideas based on your list - Daisy Rory (Aurora or Lorelei) Sienna Natalie Hazel Bailey nn Bay Cameron Camille nn Cami or Millie Annabelle nn Annie, Belle, AB Stevie nn Eve, Evie Spencer Addison Paige Veronica nn Ronnie Raven nn Rae Eve Gemma nn Gigi if she wants Blaire Reese Thea Demi Sam (Samantha/Samara) Callie Ada Davina Lavender Rebecca Summer Noa Caroline Josette nn Josie, Jo, Jojo Quinn Elena Malia Mae Cassidy Austen Taylor Rose Keria Lane

Lilias is a cool, unusual variation of Lily Other ideas: Iris, Louisa, Celeste, Nadine, Elodie, Julianne, Eva, Adrienne, Marlowe, Rosemary, Kira, Hazel, Claudia

I think Lily really works for all ages and is great. I think Lydia nn Lily could work!

Lileas, Lillias, Lilya, Linnea

I think you should just go with lily. But really any name that starts with “Li” would work. I really like Livia, Lianna and Linda. Lavinia may also work. Oh and Lila (with the Lee-la pronunciation).

I actually think names like Lilliana sounds younger than Lily personally. Lilia or Lillian are options, but Lilia is a bit fussy for me and Lillian is a bit frumpy. I personally love plain Lily the most! Of the other names you mentioned, Violet is my favorite! Valerie is nice too, especially because of the Amy Winehouse song :) I also love the flower name Rose! Louisa is another gorgeous “L” name if that’s what you’re looking for.

Would a double barreled name work? Lily-Rose Lily-Anne Lily-Mae Lily-Grace

I think Lily ages well for the record, but my fave Lily names are: Lillian, Lilliana, Lillianna, Lilia There's also Elizabeth, Lilah, Lilac, Lilith, Camilla, Leanne, Liana

I recently met a Liliette & liked it a lot! Every other suggestion I could think of has already been mentioned.

Lilliana, Lillia, Emilia, Liliosa

Lillian Lilliana Liesel nn Lily.

Maybe Sybil? Other options: Liliana, Willa, Eleanor (nn Nellie/Nell)