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If you're worried about it, you could always name her Katharine and use Katara as a nickname.
Of course, a Katara could shorten to Kat if she wanted to. I like the name.
Not pregnant, so this may change, but quite a few of these were already on my list.
I really love Everett from your list.
Other suggestions: Oliver, Louie/Louis, or Liam -?
Love: Gideon, Brooks, Marc (I really enjoy this spelling for some reason)
Like: Cameron (I like this name, but I know sooooo many Camerons), Phineas (so cute, but reminds me of the cartoon), Urban (the more I look at it, the more I like it)
Lose: Ford (too many connotations, not to mention the cars), Kristoff (Frozen), Rodney (this kinds of reads as an older person's name, but I dig that sometimes, so idk)
New List: Gideon, Brooks, Marc, Cameron, Phineas, Urban, Shepherd, Trey, Moses
Love: Erin (I have a really sweet friend with this name), Edith (Edie is a cute nn), Tasha (I know a Tasha who is basically a fairy princess, so that's what the name calls to mind)
Like: Bethany (I kind of just like Beth by itself), Persephone (I'd never use it because of pronounciation nightmares, but I think the name is sweet), Ciara
Lose: Layla, May, Jenine
New List: Erin, Edith, Tasha, Bethany, Persephone, Ciara, Juanita, Polly, Brenna
(Sorry if I repeated any names! I haven't played in awhile.)
Say: What a beautiful name!
Think: I wouldn't have thought to spell this name with a K. Also, it does call to mind the character from Rugrats.
Next name: Kit (b)
Oooh I love the suggestion of Hollis for this sibset! It reads so sophisticated to me.
What about Ellis or Carlisle (nn Carli) for a girl? or something like Elon for a boy?
I knew a girl named Jolyn and always thought it was pretty.
I kind of think Nolynn would be a cute way to honor a Nolan, but not if there's a brother that could get that name.
Kevin (Home Alone), Chris (Kringle?), Ignatius nn Nate (this one is out there, but it's in The Year Without a Santa Claus)
Honestly not a fan of Ralph.
Love: Bridget (not sure why I'm such a fan of this one right now - just refreshing to hear all those consonants?), Alice (Definitely fits my granny naming style), Astrid (I'll be honest - I like this one because of a one time character on Doctor Who)
Like: Poppy (Cute, but probably not usable in my area), Briar (I hadn't heard this by itself, but it makes me think of Briar Rose/Sleeping Beauty so I'm into it), Valerie (I do sing the song in my head when I hear it, but I like the name)
Lose: Naomi (I actually think this one is very pretty, just not likely that I'd ever use it), Lola (she was a showgirl, yellow feathers in her hair...), Lucia (I think if I was going for Lucy as a nn I'd go with Lucille, but that's a family name for me)
New List: Bridget, Alice, Astrid, Poppy, Briar, Valerie, Sage, Gertrude, Corey
Love: Bridget, Daphne, Blair
Like: Kate, Anna, Carmen
Lose: Danielle, Willow, Kelly
New List: Bridget, Daphne, Blair, Kate, Anna, Carmen, Ainsley, Piper, Rose
Love: Miles, Gavin, Theo
Like: Declan, Toby, Felix
Lose: Raymond, Klaus, Felix
New List: Miles, Gavin, Theo, Declan, Toby, Felix, Gerard, Ethan, Zane
Love: Joan, Bridget, Eleanor
Like: Grace, Phoebe, Sara
Lose: Cleo, Faith, Freya
New List: Joan, Bridget, Eleanor, Grace, Phoebe, Sara, Danielle, Charity, Kate
Love: Luke, Jack, Felix
Like: Taylor, Vincent, Declan
Lose: Aaron, Maxwell, Gustav
New List: Luke, Jack, Felix, Taylor, Vincent, Declan, Sawyer, Finn, James
Love: Gwen, Karissa, Bridget
Like: Janelle, Sara, Grace
Lose: Imogen, Della, Lissa
New List: Gwen, Karissa, Bridget, Janelle, Sara, Grace, Verity, Xena, Joan
Love: William, Julian, Paul
Like: Aaron, Jack, Maxwell
Lose: Sebastian, Edison (though I do like this for an Ed nn), Walton
New List: William, Julian, Paul, Aaron, Jack, Maxwell, Luke, Vincent, Taylor
Love: Gwen, Juliet (I wouldn't use because of Shakespeare, but I can't help but love the name. Same for Ophelia.), Margo
Like: Della, Bellamy, Imogen
Lose: Annika, Kathleen, Octavia
New List: Gwen, Juliet, Margo, Della, Bellamy, Imogen, Janelle, Bridget, Sara
Lia, Juliet, Margo, Hazel, Jamie, Josie, Natalie, Isobel, Faye
Love: Juliet, Margo, & Hazel
Like: Lia, Isobel, & Faye
Lose: Jamie, Josie, & Natalie
New List: Juliet, Margo, Hazel, Lia, Isobel, Faye, Cassandra, Marigold, Diana
Love: Joel, David, & Julian
Like: Oliver, William, & August
Lose: Henri, Manuel, Leland (I actually *like* a lot of our lose names right now. It's tough to make a decision!)
New List: Joel, David, Julian, Oliver, William, August, Paul, Devan, Griffin
Jude, Jasper, William, Sean, Anderson, Sergio, Brady, Theodore, Harrison
Love: William, Jude (can't use because it rhymes with surname!), & Harrison (we named the cat this)
Like: Sean, Theodore, & Jasper
Lose: Anderson, Sergio, & Brady
New List: William, Jude, Harrison, Sean, Theodore, Jasper, Oliver, Joel, Julian