Concerning the naming of chain fishing resorts and fishing APPs, the following points can be considered:

Words related to fishing: fishing, fish ponds, fish ponds, fish farms, etc.

Words related to geographical location: such as cities, regions, scenic spots, parks, etc.

Words related to leisure and entertainment: such as paradise, fun, leisure, vacation, etc.

Based on the above considerations, some possible names are as follows:

Fish Pond Paradise

Fishing Paradise

Fish Pond House

Fishing World

Fish Pond Fun

Fishing Home

Fishing Paradise

Fish Pond Fun

Fishing Fun

Yuchi Resort

As for the name "Hundred City Fishing Resort", from a trademark perspective, it has certain commercial value and potential. However, it should be noted that before trademark registration, a professional evaluation and search of the trademark is required to ensure that the trademark complies with trademark laws, regulations and trademark review requirements, while avoiding infringement of the trademark rights of others.