So, hey, ladies!
Last week, we found out we are expecting a boy (yay!). I just received a text from my MIL tonight that said "I'd like for him to be named Murphy after my Irish family. Middle name is fine."
Uh..... 
We were planning on an Irish first name for our boy anyway (DD has an Irish first name as well). My family has zero Irish in it, it's all DH's side. And, of course, our baby gets DH's family's last name. I would think that is enough homage to DH's family. And, to be honest...I really dislike "Murphy".
But the thing that bothers me the most is how she worded it.  Almost like we don't have a choice here.  I guess I want to know how to tactfully respond to her (after DH and I talk it over, of course).  Ideas?  
Re: MIL name situation...
I definitely say talk with DH about it. Perhaps ask her if she has any other suggestions? I don't like the way she worded it either. It's more of a demand than a request which is rather rude considering it's not HER baby. Anyway, see if she has any other names on the list? Tell her perhaps you'd like something shorter, or longer, just make it up to get her to dish out a few more.
MILs are tricky business. GL!
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I hate to be judgemental but I think it is so rude of your MIL to almost force her will upon you. She had her kids and chance to name them. You're correct that you already pay homage to your DH 's side with the last name. Your little man, your choice!
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LOL, I love this.
In all seriousness, I agree with pp's suggestions. Either tell her you already have a name, or tell her you'll add it to the list and think it over. Or, you could just flat out tell her you're sorry, but that it's not your style. Bottom line, it's your choice, not hers, and despite how she worded it, most people would understand that naming the baby is you and DH's decision, not hers.
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Just keep swimming.
"Middle name is fine."
This is the part that killed me. Oh really, MIL? You'll allow me to use it as a middle name? My blood would BOIL. I appreciate that your desire here is to be tactful because she obviously isn't!
She wouldn't ever be described as a "tactful" person...
It's funny you should mention this, because one of the ladies we dogsit for has a "Murphy" and that dog is all I think about when I think of that name!
Since you say she is not a "tactful" person, I wouldn't hesitate to say straight out that you already have a name picked out and you will share when LO gets here.
Definitely rude of her to do that. And Murphy is a last name, not a first name (no offense to Murphy Brown)...
Yikes, that's crazy! I would just tell her that you guys have already decided on a name...and if she continues to pressure you have DH shut her down. That is SO not her place!!!
Good Luck!
I think I'd probably do this. Tell her that we have already chosen the baby's name. If that doesn't work then i would ask my husband to help out. He is really tactful with things like this whereas at the moment I am quite reactionary. I really enjoy getting baby name suggestions but like yourself would feel very uncomfortable if they were expected of me.
Congrats on your little boy! I would word it as:
"Thank you for your input. The great news is that we already have planned on an Irish first name so the heritage will be honored!"
Just leave it at that and move on. I'm not a fan of Murphy either
 GL! 
EDD 1/31/13, MC May 17. EDD 3/31/13, MC July 26. I miss you so much already my angel loves
Is there anyway she was kidding and it didn't come across in text? You know her so I am guessing if she made awkward jokes you would have known and she would have ended it with a haha or lol. I only thought that because my dad makes jokes about us naming our little girl Edwina after him because his name is Edward and adds but if you just want Edwina as the middle name that's fine too. He is 110% kidding and makes weird jokes all the time and we will joke back about baby Edwina, even thought he knows the real name and loves it haha.
If she wasn't kidding then I just would not respond. My MIL can be pretty rude and I can not tell you how many times I just do not respond to her texts because there is nothing nice I could say. I will tell DH your mom texted me this today and I didn't respond but if you want to talk to her about it go for it. I am lucky mine lives across the country and I see her usually once a year.
I think honesty is the best policy. If you dont like the name, just tell her that (politely).
My inlaws did something similiar, they said they came up with Jayden Marie and thought it was perfect. No offense to anyone who likes the name, but Jayden is probably at the top of my most disliked names list. I quickly said thanks for thinking of the baby, but we were pretty sure we had already decided on a name (which we had). Upfront, easy, and no need to get DH involved. They havent made suggestions since.
I like this response. Even if the name is out of the question. Your MIL has some nerve.
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Yep. My MIL tried naming our baby as soon as she found out I was pg. She said "well (H's grandpa's name) is a family name." I said "oh, well you had 3 boys, why didn't you name any of them that?" It's H's youngest brother's middle name, but still. Don't try and name my kid when you've had 3 of your own to name.
You could reply with something like - We are looking at several Irish names. Thanks for the imput. - and leave it at that.
When anyone has a name suggestion for me I usually repeat the name with a polite nod and don't really engage further in the converstation. DHs family is all pretty vocal with suggestions. I try to just brush it off. DH and I don't really offer any info on what we are talking about as far as names. Both DSs were not offically named until they were born.