Three years reigned he in Jerusalem. And his mother's name was Maachah, the daughter of Abishalom.

He reigned three years in Jerusalem: the name of his mother was Maacha the daughter of Abessalom.

three years he hath reigned in Jerusalem, and the name of his mother is Maachah daughter of Abishalom;

Three years - More strictly, not much more than two years (compare 1-Kings 15:1, 1-Kings 15:9). Any part of a year may, however, in Jewish reckoning, be taken as a year.
His mother's name was Maachah - Or Michaiah, according to the present reading of marginal reference.
The daughter of Abishalom - Absalom seems to have had but one daughter, Tamar 2-Samuel 14:27, so that Maachah must have been, not his daughter, but his grand-daughter. Her father (see the margin) was Uriel of Gibeah whom, therefore, Tamar married. Maachah took her name from her great-grandmother 2-Samuel 3:3.

Three years reigned he in Jerusalem. And his mother's name [was] Maachah, the daughter of (a) Abishalom.
(a) Some think that this was Absalom Solomon's son.

Three years reigned he in Jerusalem,.... And three only; his reign was short, and indeed not three full years, only one whole year and part of two others; for Asa his son began to reign in the twentieth of Jeroboam, 1-Kings 15:9 so that he reigned part of his eighteenth, this whole nineteenth, and part of his twentieth:
and his mother's name was Maachah the daughter of Abishalom; called Absalom, 2-Chronicles 11:20, generally supposed by the Jews to be Absalom the son of David, and which may seem not improbable, since his other two wives were of his father's family, 2-Chronicles 11:18. Josephus says (q) she was the daughter of Tamar the daughter of Absalom, and so his granddaughter; and which may account for her being called Michaiah the daughter of Uriel of Gibeah, 2-Chronicles 13:2 since the difference between Maachah and Michaiah is not very great; and Uriel might he the name of Tamar's husband; though it is most likely that both father and daughter had two names; she seems to be mentioned here, to observe that she was the cause and means of her son's disagreeable walk, as follows, see 1-Kings 15:13.
(q) Antiqu. l. 8. c. 10. sect. 1.

Three years reigned he--(compare 1-Kings 15:1 with 1-Kings 15:9). Parts of years are often counted in Scripture as whole years. The reign began in Jeroboam's eighteenth year, continued till the nineteenth, and ended in the course of the twentieth.
his mother's name was Maachah--or Michaiah (2-Chronicles 13:2), probably altered from the one to the other on her becoming queen, as was very common under a change of circumstances. She is called the daughter of Abishalom, or Absalom (2-Chronicles 11:21), of Uriel (2-Chronicles 13:2). Hence, it has been thought probable that Tamar, the daughter of Absalom (2-Samuel 14:27; 2-Samuel 18:18), had been married to Uriel, and that Maachah was their daughter.

Three years - That is, part of three years. Abishalom - Or, of Absalom, as he is called 2-Chronicles 11:21. And because he is here mentioned as a known person, without any addition of his kindred or quality, some conceive that this was Absalom's daughter, called properly Tamar, 2-Samuel 14:27, and from her royal grandmother, 2-Samuel 3:3, Maacah.