SarahJConnor - I take your point, but I think Op was making the original point about white british people calling their children 'yoonique' names.
Jamaican culture os very different from UK culture, as all cultures are different. People on here don't tend to laugh at Jamaican names, in the same was they don't laugh at traditionally African names like Blessing or Mercy, or Indian names like Suminder, though they are different to the white middle class 'norm'.
They do laugh at white people born in the Uk, who have no links to other cultures giving their child a 'unique' name or spelling as it is sort of the opposite of british reserve. I.e. it's seen in poor taste in the Uk (as I'm sure you know, as you are british!) to assume greater importance or merit than you seem to own, or to make yourself or your children seem important. So calling your child 'Royaltee' when you live in poverty and left school at 15 seems very ironic, and people love to laugh at the foolishness of others. Same with calling your child 'Alyvia' - the implication is your child is soooooo much better and more unique than all of the boring Olivias. Which, well, maybe they are, but its a bit of an embarrassing statement to make, especially if you aren't the sort of person other people view as 'high status'. Celebrities can get away it, as they have a high status in society.
American culture is much more 'look at me and how great I am', so I imagine it is more acceptable there.
I work with children, and I see a lot of side eye glances and smirks at some of the unique names for white british children, but I've never seen a child of a BAME background mocked for their name.