Murano is a place in Italy and it does have a recognisable style in glass. As the glassmakers are no longer put to death if they try to leave the country, they are entitled to go where they can. Using their family name is fine but it would be more honest to add the word style if they use the word Murano to describe their glass.
My pet hate is Russian Murano Animals! I will not touch them on principle, the sellers never give the names of the artists but boast that they are highly skilled artists...
But of course people will buy them and in a label conscious world, probably that Murano word has an impact on their buying.