What is the full code name of this electronic device?
With a lot of luck someone would know what vendor uses these markings.

In all likelihood, nobody will.

We'd need more context to confirm, but considering the thick traces around this: Probably a switch-mode power supply controller.

Your picture isn't good enough, we can't tell whether this is 6-DFN, or BGA, and there's no absolute size reference, so your best chance is searching through catalogs of 6-contact-packages and hope it's one of these.

Regarding the thing you're probably asking this for: if this component is broken, so is probably a flyback diode somewhere, or an external switch semiconductor. Repair will be hard without an actual schematic.

In fact, here's a list of 2×2mm packages that fit your description. I don't think it's just a transistor package.