My grandma named one of her 4 daughters after her
Not that it's any of my business here, but I'm divided as to how I think I'd feel, if that were me. I know it's not intended that way, but thinking through how it would make people feel, on the one hand, the namesake daughter might be resented by the others as she got Mum's name, which might mark her out as special/favourite; but then the namesake daughter might equally resent her three sisters, as they all got their own individual names, whereas she ended up just getting Mum's name, as thought she were an extension of her and not a person in own right, like her sisters!
Obviously, children usually arrive one at a time and you have to name this baby before you know which others will/won't come along at a later date, but once the family is complete, you have the fixed dynamic for everybody's lifetime.
Personally, I'm very much not in favour of giving your child the same name as you, and I've no idea why you would think it a wise thing to do, but what I find even odder is when a child who is not the first daughter/son in the family ends up with the parent's name.
If that's your 'thing' that you want to do, why would you let one or more children of the appropriate sex go by without giving them mum/dad's name - not knowing if you'll have another; and if you give your 2nd/3rd/4th DD/DS their mum's/dad's name, does that mean that, rather than deliberately choosing to 'honour' them/the parent with the same name, you just completely ran out of ideas and thought "Oh, that'll do"?!
I agree with PP that it would seem so weird calling out your own name when addressing your child - especially when you're a sensible, grown-up 42yo Jack and you find yourself saying/shouting "Well done, Jack, have you had a poo? Good boy!!"; "Jack, put your socks on NOW!"; "Jack, come away from that muddy puddle!"
Not to mention every single time your wife/mum says "Jack...." and you both reply and/or have to wait for further clarification as to which one she wants. For the simplest of questions, it's "Jack....erm, big....husband Jack, Dad - yes, you - could you pass the potatoes, please" - none of which would ever have been necessary if only you'd called your son James instead!