The COVID-19 Greek

WHO decides the Greek alphabets for the Wuhan virus and why and how? Is Delta not followed by Epsilon? Why jump so many alphabets to Omikron? Are they afraid that if they go sequentially, one of the variants will be Xi?

Α α alpha a

Β β beta b

Γ γ gamma g

Δ δ delta d

Ε ε epsilon e

Ζ ζ zêta z

Η η êta ê

Θ θ thêta th

Ι ι iota i

Κ κ kappa k

Λ λ lambda l

Μ μ mu m

Ν ν nu n

Ξ ξ xi ks

Ο ο omikron o

Π π pi p

Ρ ρ rho r

Σ σ, ς sigma s

Τ τ tau t

Υ υ upsilon u

Φ φ phi f

Χ χ chi ch

Ψ ψ psi ps

Ω ω omega ô

Well, Sydney Morning Herald gave the reason in "Why WHO chose 'Omicron' not 'Xi' for new COVID variant" (added 2021-11-28).