plugsend~ object-name can't be changed using message
plugrecieve~ understands set (object-name) but plugsend~ doesn't. It seems like a mistake because send and send~ object-names can be set with messages. I tried to find a workaround but it is pretty lame.
not long ago [send] coudnt do it either - but there is [forward] for that.
also: plugsend/receive~ are legacy objects (from times when pluggo was around). They still work but are officially not supported anymore.