Proper noun
Ahaz
A king of Judah mentioned in the book of Kings.
Background According to some, Nahum prophesied in the beginning of the reign of Ahaz (740s BC). Source: Internet
It is more probable that Ahaz was twenty-one or twenty-five when Hezekiah was born (and suggesting an error in the text), and that the latter was thirty-two at the birth of his son and successor, Manasseh. Source: Internet
And according to Matthew (1:6-9), Ahaz was indeed a descendant of David. Source: Internet
The body of evidence points toward a date of for Joel, based on the above and the campaigns of Edom and the Philistines, both recorded as attacking Judah early in the reign of Ahaz (731-715), see 2Chr 28.17-18. Source: Internet
If you go back and read it again you'll notice that Ahaz rejected the sign and then in turn a sign was given to the house of David (Ahaz was simply addressed as a representative). Source: Internet
No, it means that Ahaz was. Source: Internet