דברי הימים ב טז:ב פירוש: רש״י

in Damascus And in I Kings (15:18) it is written, “Damesek,” and in another verse (II Kings 16: 10) it is written, “Dumesek.” It is all the same, an example being שׁוֹט, שֵׁבֶט, שַׁרְבִיט, whip, rod, scepter.