My daughter's name is Madisyn Kyra, trying to come up with something that goes well with that!

neither.

McKenzie is too similar to your daughters name (esp. w/that horrible spelling)
Jordan is too popular and rather boring and not very feminin.

What about Madalee or Madelynn for a girl?

Quoting Mama Jailbait ♥:“ What about Madalee or Madelynn for a girl?”

that would be almost identical to her other child

Quoting Mama Jailbait ♥:“ What about Madalee or Madelynn for a girl?”

Madelyn is much much better. However, she's already got a M name.

What about something like
Charlotte????

Adding an unnecessary 'y' to a name doesn't make it unique.

If I had to pick, I'd pick Jordan.

Quoting brittany leann.:“ Adding an unnecessary 'y' to a name doesn't make it unique. If I had to pick, I'd pick Jordan.”

Maybe she just likes Y's. I do. I spelled my daughter's name Kaeli because I like the way it looks, not because I was trying to be different.

Quoting Devil Duckie:“ Madelyn is much much better. However, she's already got a M name. What about something like Charlotte????”

I love charlotte, jana, delanie, and shaylee.

Quoting Mama Jailbait ♥:“ I love charlotte, jana, delanie, and shaylee.”

Hey, I'm Jana with an extra n, lol.

I think both spellings look rather illiterate.

Quoting Snot Fountain:“ Hey, I'm Jana with an extra n, lol.”

lol one of my bestfriends name is Aimee Jana and i LOVE it! i want her name. it's 10x better than plain old Rachael Leigh. boooring!  

OP, I'm not really a fan of Jordyn Ann together, but I do like the name Jordyn more than Mackynzie.

Quoting Snot Fountain:“ OP, I'm not really a fan of Jordyn Ann together, but I do like the name Jordyn more than Mackynzie.”

  As do I.

Quoting brittany leann.:“ Adding an unnecessary 'y' to a name doesn't make it unique. If I had to pick, I'd pick Jordan.”

I don't want it to be unique, just spelled crazy!
My other kids names are all spelled "oddly"
Rebbecca, Alexandrea, Tristin.....they're not the "standard spelling" of them and that's what I was looking for! I do however, kinda like the "Y's" for some reason!

and OP, My daughters name is Hadleigh & people still get confused about how to pronounce it even though it is completely obvious, so i would stay away from extra letters.