There r hundreds and kazillions of girls names ending in A, but it is much less common for a girls name to end in O.
list ur favourites here!
[name_f]Aiko[/name_f]
Kamiko ([name_m]Little[/name_m] [name_f]Goddess[/name_f])
[name_f]Keiko[/name_f] (blessing)
[name_f]Kiyoko[/name_f] (pure, clean)
[name_f]Koko[/name_f]/Coco
[name_f]Yoriko[/name_f] (reliable)
[name_f]Yoshiko[/name_f] (respectful, good)
[name_f]Yukiyo[/name_f]/Yukiko (snow)
Yuriko
[name_f]Margo[/name_f]
[name_u]Bo[/name_u]
Edit: Forgot Kaiyo, Kyoko, and Monaco and I think everyone else got the others I missed
Edit2: I’ve discovered Koto and Aoko
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In addition to the great suggestions so far, I’ll add [name_u]Echo[/name_u]
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yes thats lovely!
Calypso
[name_f]Aniko[/name_f]
[name_f]Io[/name_f]
RocĂo
[name_f]Ivalo[/name_f]
[name_u]Marlo[/name_u]
[name_f]Cleo[/name_f]
[name_u]Rosario[/name_u]
[name_f]Milagro[/name_f]
[name_u]Coco[/name_u]
[name_f]Lilo[/name_f]
[name_f]Margo[/name_f]
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Arlo
[name_u]Cato[/name_u]
[name_u]Coco[/name_u]
[name_f]Juno[/name_f]
[name_u]Indigo[/name_u]
[name_f]Lo[/name_f]
[name_m]Philo[/name_m]
[name_f]Lilo[/name_f]
[name_f]Margo[/name_f]
Isabo
Annabo
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Sorry for any repeats!
A lot of these are Japanese names, it’s fairly common for a girl’s name to end in O there!
Margo
[name_u]Miko[/name_u]
[name_f]Lilo[/name_f]
[name_f]Callisto[/name_f]
[name_f]Juno[/name_f]
[name_m]Kiko[/name_m]
[name_f]Isabeau[/name_f]
[name_u]Calypso[/name_u]
[name_f]Cleo[/name_f]
[name_f]Chihiro[/name_f]
Nao
Mariko
Meiko
[name_u]Harlow[/name_u]
[name_u]Marlowe[/name_u]
Ayako
Nanako
Maiko
[name_u]Rio[/name_u]
[name_u]Coco[/name_u]
[name_f]Momoko[/name_f]
Mitsuyo
Eiko
Yuriko
[name_f]Riko[/name_f]
Shiho (love this but unfortunately it would be privy to a ridiculous amount of teasing in an english speaking country)
Sato
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O ending
[name_u]Echo[/name_u]
[name_f]Juno[/name_f]
[name_f]Flo[/name_f]
[name_f]Margo[/name_f]
[name_f]Ivalo[/name_f]
[name_u]Bo[/name_u]
[name_u]Coco[/name_u]
[name_f]Dido[/name_f]
[name_f]Io[/name_f]
[name_f]Lilo[/name_f]
[name_u]Hero[/name_u]
[name_f]Cameo[/name_f]
[name_f]Margalo[/name_f]
[name_u]Jericho[/name_u]
O sounds
[name_u]Marlowe[/name_u]
[name_f]Prideaux[/name_f]
[name_f]Isabeau[/name_f]
[name_u]Juneau[/name_u]
[name_f]Doe[/name_f]
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What about:
Margo
[name_f]Cleo[/name_f]/Clio
[name_u]Coco[/name_u]
[name_u]Indigo[/name_u]
[name_f]Juno[/name_f]
[name_u]Jo[/name_u]
[name_u]Calypso[/name_u]
[name_f]Lilo[/name_f]
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Arlo
[name_u]Arrow[/name_u]
[name_f]Cleo[/name_f]
[name_u]Hero[/name_u]
[name_f]Juno[/name_f]
[name_u]Roux[/name_u] (sort of an O sound!)
[name_u]Willow[/name_u]
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My favorites that end in “o” (or an o sound):
Juno
[name_f]Margo[/name_f]/Margot
[name_f]Cleo[/name_f]
[name_u]Willow[/name_u]
[name_u]Indigo[/name_u]
[name_u]Marlow[/name_u]
[name_u]Sparrow[/name_u]
[name_u]Coco[/name_u]
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I really like [name_f]Llio[/name_f] said like ch-lee-oh (sharp o) but the ch is like with an L over it.
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Umeko is my favorite that hasn’t been mentioned! I really like [name_u]Nico[/name_u] for a girl, too. And [name_f]Kimiko[/name_f] hasn’t been mentioned, so I’ll add that as well.
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Rio
[name_u]Cairo[/name_u]
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i love [name_u]Arlo[/name_u] for a girl, its lovely 
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My favorites have all been listed but I definitely concur with [name_f]Cleo[/name_f], [name_u]Hero[/name_u], [name_u]Indigo[/name_u], and [name_f]Juno[/name_f]!
The only one that I can think of that hasn’t been mentioned is [name_f]Yoko[/name_f]. 
Cairo
[name_f]Juno[/name_f]
[name_f]Keiko[/name_f]
Topacio
[name_u]Hero[/name_u]
[name_f]Cleo[/name_f]
My favourites will probably have to be:
Callisto
[name_u]Calypso[/name_u]
[name_f]Cleo[/name_f]
[name_u]Echo[/name_u]
Eniko
[name_u]Hero[/name_u]
[name_m]Kiko[/name_m]
[name_f]Margo[/name_f]
[name_f]Momo[/name_f]
[name_m]Pluto[/name_m]
Tomiko
Amparo
Naho
My favourites (already listed)
[name_f]Juno[/name_f]
[name_f]Ivalo[/name_f]
[name_u]Arlo[/name_u]