The one on the left is called Fred, but I don't know any of the other ones.

Seriously, they look like either bubbles or coating defects. Bubbles have a tendancy to be more defined with sharper edges, and coating defects are often like bubbles, sharp edged, or they are diffuse in outline as yours seem to be.

If it is a coating defect, then it is either dust and dirt in the emulsion, or some undissolved gelatin particles.

PE