What are the individual names of these nine different PVC fittings?
From left to right, top to bottom:


3 way elbow
4 way tee 
5 way tee 
tee 
internal cap 
cross 
90 degree elbow
slip sling tee 
45 degree elbow


Since these appear to be structural PVC fittings, one source: http://www.formufit.com/structural-pvc-fittings/?sort=featured&amp;page=1