Would like to know the Cantonese dialect name of this hanyu pinyin yu heng?

The Cantonese dialect name for the Hanyu Pinyin yú héng (鱼横) is jyu4 waang4.

Here's the breakdown:

* yú (鱼) in Hanyu Pinyin becomes jyu4 in Cantonese.

* héng (横) in Hanyu Pinyin becomes waang4 in Cantonese.

So, yú héng (鱼横) in Cantonese is jyu4 waang4.

It's important to note that Cantonese pronunciation can vary slightly depending on the region.