Currently there are 16 native Wideangle Zoom lenses for Sony A6400 and 15 of these lenses are autofocus (AF) type.
Sony A6400 doesn't have a sensor based image stabilization system but 2 of these Wideangle Zoom lenses features optical image stabilization.
Since Sony A6400 has environmental sealings (Weather Sealing), you may like to couple your camera with one of these 12 Wideangle Zoom lenses with Weather Sealings.