The name is [name]Peri[/name]. I think it’s cute but I’m wondering if this could be short for something. What do you think?
Could be short for [name]Vesper[/name]
My first thought is [name]Persephone[/name]. I know a little girl named [name]Perrin[/name], too, I think [name]Perrin[/name] nn [name]Peri[/name] could work. Or even [name]Piper[/name]/[name]Harper[/name], nn [name]Peri[/name]?
Good luck!
Periwinkle? 
Hespera
[name]Vesper[/name]/[name]Vespera[/name]
[name]Peridot[/name] (could be nicknamed either [name]Peri[/name] or [name]Dot[/name])
[name]Harper[/name]?
[name]Persephone[/name] is great.
[name]Juniper[/name]
[name]Pepper[/name]
[name]Peregrine[/name]
[name]Perla[/name]/[name]Pearl[/name]
Vespertine
[name]Temperance[/name]
[name]Jasper[/name]
[name]Casper[/name]
[name]Rupert[/name]
[name]Cooper[/name]
[name]Draper[/name]
[name]Percival[/name]
[name]Peridot[/name] was my first thought too! It’s adoreable.
Also:
Perimede (a beautiful witch in greek mytholgy)
Perina (or [name]Pierina[/name])
Periboea (another greek mythology name)
[name]Persis[/name] nn [name]Peri[/name] would work too!
I think of [name]Persephone[/name].
Maybe Periwinkle, if your daring!
I have actually known of a girl whose full first was [name]Peri[/name], spelled the same way and used as a stand-alone name.
I can only think of word names that haven’t been suggested yet. [name]Prosperity[/name] or [name]Temperance[/name]. =]
[name]Just[/name] want to chime in and say how brilliant you all are! But also to say that [name]Peri[/name] is one of those names, like [name]Finn[/name] or [name]Rory[/name], that sounds like it must be short for something (and certainly can be) but that also is a full-fledged name with a serious history of its own: Peri for a boy or a girl | Nameberry
[name]Peri[/name] = Periwinkle?
What about Seri, nickname for [name]Seraphina[/name]?
[name]Persephone[/name] for sure.
Although, seeing “[name]Peri[/name]” makes me think of a peri bottle. Google if you dare. 
[name]Peri[/name] on it’s own feels too masculine, like [name]Perry[/name].
Persphone and a few of the other suggestions are nice, but on it’s own, it feels insubstantial and a little manly.
[name]Peri[/name] on its own also reminds me of the [name]Peri[/name] Bottle!
I think [name]Persephone[/name] is beautiful but [name]Percy[/name] would be a better nickname in my opinion…
[name]Peregrine[/name] is beeeeeeeeautiful, and reminds me of the [name]Nicholas[/name] Flamel novels my 14 year old niece had me read.