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.
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.