Do you know that Google actually names their android versions in alphabetical order with a sweet and sugary confectionery. The following are lists of previous android versions and their nomenclatures .
 Cupcake (1.5)

▪ Donut (1.6)

▪ Eclair (2.0–2.1)

▪ Froyo (2.2–2.2.3)

▪ Gingerbread (2.3–2.3.7)

▪ Honeycomb (3.0–3.2.6)[a]

▪ Ice Cream Sandwich (4.0–4.0.4)

▪ Jelly Bean (4.1–4.3.1)

▪ KitKat (4.4–4.4.4, 4.4W–4.4W.2)

▪ Lollipop (5.0–5.1.1)

▪ Marshmallow (6.0–6.0.1)

And its even speculated that the next version which is android 7.0 would be named NUTELLA.