ELI5 Surnames - why Green and Brown but not Blue or Red?

Why do some colors make for popular surnames (like Green, Brown, Black), but others don't (like Blue, Orange, Red)? Why are there so few Korean surnames? What is the queen's last name?   ... We explain like i'm five!   Thank you to the r/explainlikeimfive community as always and in particular the following users whose questions and comments formed the basis of this discussion: c0mandr, jilinoppaa, adioscorea, awoelt, jogan598, macgyvermacguffin, alphagammabeta1548, dublinirish & taurius To the ELI5 community that has supported us so far, thanks for all your feedback and comments. Send us an e-mail: [email protected]