I got 1, which is sub-random, and that was Jess Gwynne. I have no idea who she is, but I have the power to automatically detect people called Jess. Honestly, I can look out the window and spot any passing Jesses.
Does that make you a big Jessie? 
I managed to get all four of the Jess Gwynne, Anne Marie and the other two women's names I forget questions wrong. 
7/15 - 6 guesses though I did know who Dua Lipa is.
Meh, course I don't know who they are. I wonder how all these youngsters would do on a quiz like this in 30 years time (which is about how far I am removed from giving a shit about the current music scene).
I am disappointed to learn that
Jess Glynne is in fact a
Jessica, or a faux-Jess. Actually Googling those opened a doorway to lots of people who are both famous and I've never heard of.
Jax Jones?
Jax? When did that start being a name (didn't we do
Jaxon a while a back). Marvellous, I'm old and very pleased about it.
I can spot proper Jesses though. OK I did it once. And sort of. Many, many years ago (in a galaxy far, far away), I may have met a young lady of multifarious charms whose name I neglected to obtain at the pertinent moment and later, when when it became expedient for me not just to know her name, but actually use it, I realised the dangerous breadth of the lacuna and the fact it was far too late to attempt to fill it by asking. Scrambling around in my head and realising there are a lot of women's names and only one of them would actually work and any other would likely entail a grisly and not entirely undeserved fate, the word
Jess simply popped into focus. No one was more surprised than me that it was her actual name. It was possible, I suppose, that she'd mentioned it and it had somehow become lost in the rumpled bedclothes of my mind, or maybe at that very moment a benevolent deity chose to look favourably upon me and gifted me her name. If so, I imagine it pretty miffed by my ingratitude. Still, a miffed deity is unlikely to smite you, more likely arrange an eternity of mild inconveniences. It's quite possible I'm living that eternity and that deity was named Jess too.
Jess is also, if you've been paying attention, the name of South London's most notable undead, occasional blood-binging librarian, though this is unrelated.
