What is the name of the film about a mermaid and a man who love eachover?

The film you're referring to is likely "The Shape of Water," directed by Guillermo del Toro. It tells the story of a mute woman who forms a deep bond with a mysterious aquatic creature held captive in a government laboratory. Their connection transcends language and societal norms, exploring themes of love and acceptance. The film received critical acclaim and won several Academy Awards, including Best Picture.