Peace OneGOD and Alexei,
Read the entire passage of Isaiah 9:
To Us a Child Is Born
1 Nevertheless, there will be no more gloom for those who were in distress. In the past he humbled the land of Zebulun and the land of Naphtali, but in the future he will honor Galilee of the Gentiles, by the way of the sea, along the Jordan-
(The Roman Gentiles occupied Galilee during Jesus's time.
Jesus was in the Sea of Galilee many times with His disciples.
Jesus certainly walked along the Jordan during His ministry)
2 The people walking in darkness
have seen a great light;
on those living in the land of the shadow of death [1]
a light has dawned.
3 You have enlarged the nation
and increased their joy;
they rejoice before you
as people rejoice at the harvest,
as men rejoice
when dividing the plunder.
4 For as in the day of Midian's defeat,
you have shattered
the yoke that burdens them,
the bar across their shoulders,
the rod of their oppressor.
5 Every warrior's boot used in battle
and every garment rolled in blood
will be destined for burning,
will be fuel for the fire.
6 For to us a child is born,
to us a son is given,
and the government will be on his shoulders.
And he will be called
Wonderful Counselor, [2] Mighty God,
Everlasting Father, Prince of Peace.
When you see the entire passage you can put the pieces together and see that it's clearly about Jesus Christ.