Name of plug at end of charging cable?

I don't think it's any named standard. It's a proprietary garmin connector (one of many).

Hello! We refer to it as "charging contacts." Anything, I can help with?

Now I have someone to complain to.

I am now on my third charging cable in 18 months for my Vivosport.  Both of my prior ones failed when one of the four pins either got ground down or broke from the repeated stresses of inserting the plug to make contact. This plug connects with a male tip touching a flat circular metal plate.  The stress on the tip is obvious. I cannot see it well enough to distinguish between the two causes, but I can see that one of the plugs become significantly shorter than the other three and not long enough for the tip to contact the plate.

All my other connectors, electric, ethernet, and USB work by pieces of metal sliding over and past each other to make contact.  I don't think I have another connector in my house that works by tip contact.  Tip contact looks to me like a bad idea with little use.

Proprietary connectors also provide a potential monopoly for a seller for replacement cables.

This connector looks a bad design intended to fail  to generate the sale of replacement cables and take the consumer to the cleaners in the process.