Here is a novel idea. Just pronounce ECMA as a 2 syllable word using classical Latin pronunciation. Ecma becomes just as catchy as Java when pronounced that way. For English speakers who do not know classical Latin, just read this:
Eck-Ma-Script
Here is Eck for those who do not know:
As for Ma, it is the second half of mama. That is actually /ɛkmɑskɹɪpt/ rather than /ekmaskɹɪpt/, but it is close enough.