A Pantone textile color
This shade comes from Pantone. In its textile color list, called TPX, number 17-3617 is named English Lavender. The Wikipedia article on lavender describes it as a medium light, grayish pink lavender. On the ISCC-NBS scale it is a grayish purplish red.
The name likely comes from the garden plant Lavandula angustifolia, which is commonly called English lavender. Pantone gives no reason for the name, though.
Dusty, not pastel
English lavender is much grayer and pinker than the CSS keyword lavender or floral lavender. It is close to Mountbatten pink and a bit lighter than mauve taupe. Black text is the safer choice on it, at 6.62 to 1.

