They wouldn't of named girl's after flowers. People were named Biblical names, after saints, or variations of saints/biblical names. Many common Briton, Anglo-Saxon, Norse, Gaelic etc names did prevail through cultures of the time, but you will find most of those names, especially north eastern european names to be descriptive of where the person lived or looked like
Ashley - From a surname which was originally derived from a place name which meant "ash tree clearing" in Old English.
Campbell - From a Scottish surname meaning "crooked mouth" from Gaelic cam "crooked" and béul "mouth". The Campbells were one of the great Highland clans.
I doubt you will find to many people in the British area name Jasmine now a days, nvm Yasmeena... Good Christians didn't tend to name their children in the language of 'heathens'.