I discovered I share a birthday with Cardi B! I’m not too big a fan of Belcalis though.
I’d probably go with [name_f]Eleanor[/name_f] ([name_m]Roosevelt[/name_m]) nn [name_f]Nell[/name_f] or Wilding (after [name_f]Emily[/name_f] Wilding [name_m]Davison[/name_m], that counts right?) if I were a boy.
[name_f]EDIT[/name_f]: @katethegreat We share a birthday!
25 [name_f]May[/name_f]
[name_f]Dixie[/name_f] [name_f]Octavia[/name_f]
[name_f]Dixie[/name_f] [name_u]Carter[/name_u]
[name_f]Octavia[/name_f] [name_u]Spencer[/name_u]
I haven’t heard of 95% of the celebs who share my birthday lol so I’m gonna go with [name_u]Jesse[/name_u] ([name_u]Tyler[/name_u] [name_m]Ferguson[/name_m])
The two that spring to mind for me are [name_f]Elizabeth[/name_f] [name_m]Hurley[/name_m] and [name_f]Princess[/name_f] [name_f]Madeleine[/name_f] of [name_u]Sweden[/name_u]. I wouldn’t mind being named after either of them. [name_f]Madeleine[/name_f] [name_f]Elizabeth[/name_f] would be a decent combination. [name_f]Judy[/name_f] would also be an option (for [name_f]Judy[/name_f] [name_f]Garland[/name_f]) but I’m not a big fan of that.
If I was a boy, though, the only one I can remember is [name_m]Prince[/name_m] [name_m]Philip[/name_m], so maybe [name_m]Pip[/name_m].
[name_f]Rosie[/name_f] - [name_f]Rosie[/name_f] O’ [name_m]Donnell[/name_m]
Or
[name_m]Sebastien[/name_m] - [name_m]Sebastien[/name_m] Chevanel
Great question!
It’s easy for me: [name_u]Kit[/name_u] (Harington), girl or boy 
Middle name ([name_m]John[/name_m]) [name_m]Severin[/name_m] for a boy or [name_f]Elisabeth[/name_f] for a girl.
ETA: Anyone else struck by how few female names are featured here to choose from? Or is 26th December just an especially male-dominated day? 
[name_f]Danielle[/name_f], after [name_f]Danielle[/name_f] Fishel!
Edited for privacy
Good thing [name_f]Willow[/name_f] [name_m]Smith[/name_m] is a Halloween baby too cause I would totally steal her name in a heartbeat.
Not many celebs share my birthday I guess. [name_m]Tiger[/name_m] Woods was on there so kinda hard not to pick [name_m]Tiger[/name_m]. (just kidding)
Girl= [name_f]Ellie[/name_f] (Goulding, musician) Boy = [name_u]Carson[/name_u] (Wentz, american football player)
The only person I know I share a birthday with is [name_m]Alexander[/name_m] [name_m]Hamilton[/name_m], and I wouldn’t mind being an [name_f]Alexandra[/name_f].
My birthday is the 18th of [name_f]October[/name_f] and my real name is Zari!
If I were a boy I would pick [name_m]Zac[/name_m] ([name_m]Zac[/name_m] [name_m]Efron[/name_m])
If I were a girl I would pick [name_u]Tyler[/name_u] ([name_u]Tyler[/name_u] [name_f]Posey[/name_f])
Apparently I share my birthday with
[name_f]Mila[/name_f] Kunis, [name_u]Magic[/name_u] [name_m]Johnson[/name_m] and [name_m]Steve[/name_m] [name_m]Martin[/name_m]
So I’d go for: [name_f]Mila[/name_f] [name_u]Magic[/name_u] [name_m]Martin[/name_m] 
[name_f]September[/name_f] 2
[name_f]Salma[/name_f] after [name_f]Salma[/name_f] Hayek
If I was a boy [name_m]Keanu[/name_m] after [name_m]Keanu[/name_m] [name_m]Reeves[/name_m]
My real name is [name_f]Charlotte[/name_f]-[name_f]Alice[/name_f] and I was born on the 30th of [name_u]December[/name_u].
I’d choose one of the following:
[name_m]Vladimir[/name_m] (after [name_m]Vladimir[/name_m] Bukovsky)
[name_f]Savannah[/name_f] (after [name_f]Savannah[/name_f] [name_m]Miller[/name_m])
[name_m]Jedidiah[/name_m] (after [name_m]Jedidiah[/name_m] Duggar)
[name_f]Elizabeth[/name_f] ([name_f]Princess[/name_f] [name_f]Elizabeth[/name_f] [name_f]Caroline[/name_f] of [name_m]Wales[/name_m])
[name_m]Henry[/name_m] [name_m]George[/name_m] ([name_m]Henry[/name_m] [name_m]George[/name_m] Ley)
[name_f]Rosalind[/name_f] ([name_f]Rosalind[/name_f] [name_m]Hurley[/name_m])
My real name is [name_f]Megan[/name_f], and I was born [name_u]July[/name_u] 15th.
I share my birthday with the amazing [name_f]Lana[/name_f] (Parrilla)
Two other names stood out that I also wouldn’t mind~ [name_u]Tristan[/name_u] (Wilds) and [name_m]Forest[/name_m] ([name_m]Whitaker[/name_m])
My birthday is [name_u]August[/name_u] 23rd so I’d go with [name_u]River[/name_u] after [name_u]River[/name_u] [name_u]Phoenix[/name_u].
My birthday is [name_u]August[/name_u] 6th and my real name is [name_f]Madeleine[/name_f].
Jonbenet would be a cool name, if it weren’t for the murder link. I’d go for [name_f]Lucille[/name_f] after [name_f]Lucy[/name_f] Ball.
My birthday is the 25 [name_u]March[/name_u].
I’d choose one of these four.
[name_f]Aretha[/name_f] ([name_f]Aretha[/name_f] [name_m]Franklin[/name_m])
[name_u]Casey[/name_u] ([name_u]Casey[/name_u] Neistat
[name_u]Winter[/name_u] ([name_u]Winter[/name_u] [name_m]Ramos[/name_m])
[name_f]Tess[/name_f] ([name_f]Tess[/name_f] [name_m]Ward[/name_m])
I share mine with [name_f]Dolly[/name_f] [name_m]Parton[/name_m], [name_f]Janis[/name_f] [name_m]Joplin[/name_m], [name_m]Edgar[/name_m] [name_m]Allan[/name_m] [name_u]Poe[/name_u], [name_u]Jodie[/name_u] Sweetin, [name_m]Robert[/name_m] E [name_u]Lee[/name_u]. Also [name_f]Buffy[/name_f] [name_f]Summers[/name_f], though she is fictional. I guess I would be [name_f]Janis[/name_f] [name_u]Lee[/name_u] and go by [name_u]Lee[/name_u].