Mrs koala
at being offended when someone doesn't use the same name. Top right, what is their problem etc.
Op I think yadbu about the first name. You aren't sisters or best friends and don't even work together now. It is very precious of you I'm afraid. Some people don't prescribe to names 'going' together, my two boys have very different names, we chose two we loved, rather than naming DS2 something on the same theme as DS1.
Wrt the middle name, I agree that's quite weird to use both, UNLESS it is a one syllable commonly used middle name, such as rose, grace, may etc? If so you really can't take issue as sooo many girls get given those names, if you have used it because it ticks the boxes, why shouldn't she?
Honestly, it isn't a big deal and people baffle me with this kind of thing; wanting others to love and compliment their name choices then being offended if it gets used again. You say you realise nobody owns a name but really, acknowledge that, and recognise you are being quite silly.