According to the author of this book, these are the names of King David's children who were born in the city of Jerusalem: Shammua, Shobab, Nathan, and Solomon. Christians might understand this as part of the story about King David and his family, showing how important his sons were, especially Solomon, who later became a wise king.
1 Chronicles 14:4: Now these [are] the names of [his] children which he had in Jerusalem; Shammua, and Shobab, Nathan, and Solomon,
Lists different names for the children born to David in Jerusalem than those mentioned in 1 Chronicles 14:4.
1 Chronicles 3:5: And these were born unto him in Jerusalem; Shimea, and Shobab, and Nathan, and Solomon, four, of Bathshua the daughter of Ammiel: [Shimea: or, Shammua] [Bathshua: or, Bathsheba] [Ammiel: or, Eliam]