Books of Samuel in Wikipedia

The Books of Samuel (Hebrew: Sefer Sh'muel ספר שמואל‎) are part of the Hebrew Bible. The work was originally written in Hebrew, and the Book(s) of Samuel originally formed a single text, as they are often considered today in Jewish bibles. Together with what is now referred to as the Book(s) of Kings, the translators who created the Greek Septuagint divided the text into four books, which they named the Books of the Kingdoms. In the Latin Vulgate version, these then became the Books of the Kings, thus 1 and 2 Samuel were referred to as 1 and 2 Kings, with 3 and 4 Kings being what are called 1 and 2 Kings by the King James Bible and its successors...

Link: https://en.wikipedia.org/wiki/2_Samuel