You need to look up Received Pronunciation and the "Intrusive R"
Emma and I becomes "EmmarandI" rather than Emma (glottal a) and (glottal I) I.
I don't particularly like it, but in RP it's actually technically correct.
Emma and Heather would both be "Emm-uh" and "He-thuh" in RP, we don't pronounce the r as we don't have a rhotic r.
I'd actually have a very soft glottal on Mia-Anne but I can see many RP speakers saying Meer-An as technically it's an intrusive r.
There is no difference in how I say Khaki and Car Key. Kah kee in both cases.
I have a Scottish MIL who says what sounds like Cacky for Khaki to my ear so it would be Cacky and Carrr Key.
I avoided calling DD Eleanor because we say El-uh-nuh and MIL can't help but say Ella-knowrrr and I don't like that pronunciation. I also say Pa-lah-vuh and she says Pa-LA-verrr.
It's just difference in accents, that's all. Tomayto tomahto and all that.