Which name do you prefer for a girl: Summer, Megan or Briar?

none of them, unless I wanted her to become a stripper.

Megan is the only name i can stand out of the 3 names, but a lot of people say meg-un or me-gun. 
Its Meg-ann

I like Megan! Very pretty 

Summer.

I'm tired of Megan, and "briar" is a big insult where I come from; it's equivalent to calling someone a hillbilly.

Summer .

I have actually really loved Briar lately, but it does mean thorn and obviously so, so that can be a hard association. An alternate similar name is "Briony" or "Bryony" which means "to sprout" and so has a bit of a better meaning.

I like the sound of Summer, but I cannot quite picture it on a child. Maybe a nickname or middle name.

Megan is lovely, but maybe because of my age, feels overused. Meg is a lovely nickname, so maybe a Margaret (which falls more in the old name trend)? Or, I kind of love Meg on its own for a middle name.

Summer or Megan would be nice.

Briar doesn't sound right without being Briar Rose. Naming your kids after a fairy tale princess might or might not be what you're going for.

Briar by itself means thorns, so not my top choice for that reason. 

I prefer Megan/Meghan, but Summer is nice, too. Briar means "thorn," so I would avoid that name.

Briar  to me is a thorn or a thorny plant,so skip that one. Skip Summer and go with Megan.Summer could be a middle name if you really want to use it.

I like Megan the best.