Her name is based on her providers name "Miu Sakamoto"
Mew's tattoo shows her name written phonetically (how it's pronounced). The way how is written (with an [uː] that features the suprasegmental's long vowel) suggest it was used English phonetic notation, something curious considering Mew is a Japanese voicebank.
Mew's provider, Miu Sakamoto, was the subject of several interviews before the Vocaloids release and had more attention than Vocaloids such as VY1 and VY2.
In Japan, her vocals have been, for the most part, positively received, though few producers are currently using her. She is the second least popular Vocaloid 3 release for 2011, first being Tone Rion.