It can be a conversation starter that the third son's the junior, but my family tree is peppered with not-eldest namesakes, so no, it's not weird.

Charlie is still completely boy to me, especially when the full name is actually Charles, as is proper and good; while I can see it as a nickname for Charlotte, nicknames are a different sort of thing. Think of Alex and Sam -- their use as androgynous nicknames is older than Charlie's, but the full names behind them are still single-gendered. (I hope I never meet a female Alexander or Samuel, anyway!)

A lot of traditional boy names have been used for girls without going girl.  Sam and Frankie also come to mind.  I think Charlie is along the same lines-some people will like it as a spunky alternative for girls, or perhaps a nickname for names like Charlotte but I doubt it'll ever cross over totally.  And I think the trend is probably more for just Charlie-I've never heard of girls named Charles.

For me, I think it would be weird to name a 3rd son Jr, but then, I'm not a huge fan of Jr's in general.  I do like the name Andrew and AJ is OK, but I think Charles is a little better fit with your other children.  Have you considered Charles Andrew?

I think the Charlie for girls trend is a lot like Bobbi, Andi, Jackie, and Jessie, and other fashions of the past. Charles, like Robert, Andrew, John, and Jesse, have undergone a feminization fad and come out of it whole. I think what makes these names stay male is because there's a very long and storied past and present in the cultural zeitgeist. If anything, I think girl Charlies will go out as quickly as they've come in, while male Charlies will stand the test of time.

I added up all the Charlie varients for girls, and there are 2868, compared to 6898 male Charles, and 1643 male Charlies, making a total of 8541, which is roughly 3/4 of all Charlies. Even if some of the Charlottes are going by Charlie, I still don't think it'll make much difference.

I think you'll be fine. It's a solid name.

I wouldn't worry about it going girl at all, as it's a nickname for Charles, which is timeless.  I think it goes beautifully with your other kids' names too.  Charles and Thomas (Charlie and Tommy) are on my short list for boys :).

Hi! :)

I think Charlie is unisex as a nickname, like Sam, but Charles is definitely all boy.  

As far as the Junior issue, the third son being named after the father is actually an old tradition:

http://www.robsfamily.com/nampatt.php

Hope this helps!

~ the.little.glass.bluebird. :)

I think Charles nn Charlie goes beautifully with your other kids names. I know a couple of girl Charlies (which aren't nicknames) but I have come across far more boy Charlies. I don't think it's in any danger of going too girl. 

I think Charles is entirely doable as is a 3rd boy being a Jr. Two things I would also keep in mind-Drew is a girls name also, and AJ is used on girls as well. I wouldn't let that stop me though. Another thing I thought about, are the Charlie/Charley/Charleigh girls going by CHar-lee or by SHar-lee. I think there are possiblities of both. Most CH words are "hard" but I think there are some that are "soft" like Charlene.  That doesn't mean that people don't muddle things with alternate spellings/pronunciations though ;)