What does ཕལ་པོ་ཆེ། (translated to the Flower Ornament Sutra) really mean?
ཕལ་པོ་ཆེ་ is mdo phal po che (Dopel Poché in Standard Tibetan) according to the Rigpa


mdo means "sutra"
phal by itself means "ordinary (person)" 
po is a masculine agentive
che means "great", "greatest" 


One of the English translations on this site is "great host".