Mini-rant following from expanding upon >>182318791
But seriously, let's get a little into what Aechmea actually is.
I've seen posters delve into the relation the moon has with plants and water in Hinduism and Buddhism (which is an entirely correct link to establish) but I saw nothing about the deeper meaning of the name Aechmea.
First of all, you have to understand that no one in the manga who knows what feelings it carries ever even utters that name. The moonies never say it, Cairo never says it, Aechmea himself doesn't refer to himself with that. It's only Cicada who slips once and from then the gems start to use it casually, but still in no case the Prince lets it pass: he says it's "embarassing" and visibly twitches (chapters 63 and 66), and we know from Cicada that Aechmea is "ashamed" of his name.
What is the point being made then? Why would a character whose role and origin are so deeply rooted in Buddhism, as everything else is, be named after some South American plant?
Now, IRL Aechmea is not a single plant's name, but rather a genus in the Bromeliacae family. Its most known species is Aechmea fasciata which is a common houseplant. Being a genus, not all species have the same characteristics but for once Ichikawa's autism didn't concern with that, so we can assume stuff by looking just at the shared traits.
So: (at least most) Aechmeas are epiphytes, generally spiky, and have colourful flowers that come out from their leaves, that are arranged in a basal rosette pattern. What is the plant that moonies are so fond of to the point of representing it fucking everywhere? Lotus. The lotus flower's importance to Buddhism and Buddhist imagery literally can't be overstated (seriously, look that up), but for our little analysis the important thing is that the lotus flower is beautiful and symbolizes enlightenment because it's in direct contact with water and its plant is rooted in filthy mud but blossoms into a splendid, colourful, smooth flower.