Stumped on girl names

I know I've still got plenty of time to decide, but all I can think about lately is baby names. It seems to be all my boyfriend and I talk about anymore. We've got plenty of boy names on the go, and even though Kevin's convinced that we're having another boy, I can't help but dream up little girl names.
Our two-year old son's name is Grayson Isaiah, and I'm finding it hard finding a sib-set that sounds good. Some names that I like are:
Mackenzie
Claire
Sydney
Alexis
What do you guys think? I'm open to any other suggestions, and names that sound good next to Grayson.

Sydney is really pretty
Alexis is my daughters middle name though so I also like that one

I think Sydney is a great name for a little girl.

My daughter was going to be Mackenzie Faith...but a friend of mine kept calling her Mack or Kenny..and it made me mad..so I changed it to Kadence Makenna...she found out she was pregnant and is now naming her daugher Mackenzie   I like the name Alexis too..I think thats a beautiful name..I couldnt use it however because my bd's sister is named Alexis..Lexie for short.

I like Alexis, thats's what I named my daughter, I liked Leah too. So I ended up naming her Alexis Leah.

I think Alexis goes best with Grayson...

I loooooooooove the name Grayson, too :-)

I like Sydney & Alexis

i love alexis its my girls mn....and shes 13 and i still love it...

Quoting ~Kami~:“ I know I've still got plenty of time to decide, but all I can think about lately is baby names. It seems ... [snip!] ... Claire Sydney Alexis What do you guys think? I'm open to any other suggestions, and names that sound good next to Grayson.”

Alexis is my name so you kno I really LOVEEEEEE this one lol

Thanks for the input, gals. I'll probably be asking for a lot of help over the next few months, haha.

If i was having a girl Mckenzie was on my top list of girl names and Alexis (spelled Alexus) is my daughters name. Sydney is a really cute girl name that i dont hear very often... Another name i really like is Addison or Adalyn.