Pendrive is common across whole English and the non-English speaking world.
I think most native speakers who aren't technical would pick something from that list which probably doesn't have "USB" in it and then wrap it with "little" and "thing" - eg. "little thumb drive thing".
Everyone I know says flash drive or USB stick or thumb drive, roughly in that order of popularity.
When talking to some of the US customers they use it as well. It is not as popular as USB stick or Flash drive, but still quite common.
Maybe you are talking about tech people. I am talking about mix.