-1 for beccapurple.
Eric Meyer undoubtedly had a major impact on the web design community, and his knowledge and ability to share it with us has furthered the community as a whole significantly. However, I'm going to reappropriate a couple of points made by u/sethist on r/webdev.
Becca was Meyer's daughter, yes, and Meyer was a great teacher and web developer, but Becca had nothing to do with web design aside from that relationship. If we add beccapurple to the CSS standard, we have to start judging deaths to see if they're "worthy" of getting a name in the spec. If Paul Mockapetris, the creator of DNS, died in a car crash, would we add a .paul TLD to commemorate him? If someone loses their wife in a car crash and they want to rename a color too, do we tell them their loss isn't important enough or add them all?
The existing named colors were already in use before CSS as well. aliceblue, for instance, is so named because years upon years prior to CSS even existing, it was a commonly used name to refer to that exact color. No one forced a new name onto it.
There's just no place for this kind of emotional attachment in technical specifications, something which are inherently unemotional because they're intended solely to outline exactly how something must or should be done. There are probably better ways of memorializing Becca anyway.