took my time but found it. well Guessed
it was named after the marshed behind it
"M Bugsby's Marshes
This tidal mudflat, where bodies of executed pirates were hung in cages, may have been named after a New World Buccaneer. Like much of the Thames� riverbank, it was a mosquito-ridden hellhole before being drained by Dutch engineers in 1625. Later the site chosen for the Millennium Dome, it is now home to the O2 Arena."
from :
http://www.darkwaters.org.uk/piers/qe2-pier/qe 2-history.php