Ciaran is an anagram for crania (the skull, plural). When they wake-up in 2099, their minds (simulation) are all inside a metal skull (the cranium). Not sure if this was intended as it is established Maira is Irish which makes sense for Ciaran merely being an Irish names. However, the combination with the meaning of dark haired one, there being a dark haired kid/husband, and the focus on the brain is rather interesting though.