"The Forsaken Merman" by Mathew Arnold tells the story of a male mermaid, a merman, whose wife abandons him and their children. At the beginning of the poem, he asks their children to call her back, but she is too focused on reciting the Bible in the church to hear them. The merman takes their children closer to the church, to the graveyard, but the priest closes the church door.
It seems that his wife has chosen God and life on the land over her family and life in the sea. However, her choice does not seem to have been a simple one. There is a suggestion she is at least part human. As the narrator states, she tells him,
I must go, to my kinsfolk prayIn the little grey church on the shore to-day.
She left lonely for everThe kings of the sea.