This friendly brand name is completely invented and has no established meaning.
Jemva has only five characters and only two syllables. Two syllable names make popular global brands. Established brands using two syllable names include Walmart, Dropbox and Google.
Jemva.com is a dot-com domain. Dot com domains are the most desirable domain extension in the world, used by famous websites like google.com. Once secured, a dot-com all but guarantees no-one else can outrank you for your own name in the long run.