There are many ways you can name your dynasty. It depends on how you get your throne: as an usurper? Or as a warlord?
If you are an usurper, you most likely have already gotten a title of prince-hood from the previous emperor, which most likely is based on one of the ancient states.
If you are an warlord, you might like to name your dynasty after a name associated with actual region/province your army is based. Like Qin(Shaanxi), Han(Sichuan), Wu(Lower Yangtze), Qi(Shandong Peninsular), Liao (Liaodong Peninsular). You can even use names such as Guang(Guangdong), Xu(Xuzhou), Min(Fujian) or Tai(Taiwan

) if it sound nice and you actually started there. Then you get the emperor to appoint you as the "prince" of this region.
But either way, you have to get the emperor to appoint you a title of prince-hood of X, and then he need to abdicate in favour of you (Shànràng), than you can name your dynasty after X. That's why sounds illegitimate to name your dynasty after an adjective.
In that respect, Shen 沈 Xing 邢 Lai 萊 Lu 鲁 Cai 蔡Cao 曹 are all good.
And Guang 廣 is good because it could be associated with Guangdong. I’ve long been curious of an Cantonese-led unification of China. They failed twice IOTL (Taiping and ROC)
I wouldn't name my dynasty after a overtly powerful or major ancient states or ancient dynasty. They would steal my thunder. Therefore Wu is out, because I don't want to compete with Fuchai or Sun Quan.