Hi, the photo looks a lot like one I have in my garden..."Lavender Stardust." You may wish to look it up and see what you think. I thought mine would have more lavender, but it did not. I agree there are so many kinds that unless it is a very popular cultivator, one might not be able to ID it. I am aware that the photos sent from the suppliers look like they will be more the lavender I was expecting, but not the case.
Good luck with your ID search!