2 Heb “the thirsty.” Parallelism suggests that dry ground is in view (see “dry land” in the next line.)
3 Heb “and streams”; “floods.” The verb “cause … to flow” is supplied in the second line for clarity and for stylistic reasons.
4 The Hebrew term בֵין (ven) is usually taken as a preposition, in which case one might translate, “among the grass.” But בֵין is probably the name of a tree (cf. C. R. North, Second Isaiah, 133). If one alters the preposition bet (בְּ) to kaf (ךְּ), one can then read, “like a binu-tree.” (The Qumran scroll 1QIsaa supports this reading.) This forms a nice parallel to “like poplars” in the next line. חָצִיר (khatsir) is functioning as an adverbial accusative of location.
5 The Hebrew text has a Qal verb form, “and another will call by the name of Jacob.” With support from Symmachus (an ancient Greek textual witness), some read the Niphal, “and another will be called by the name of Jacob.”
6 Heb “and by the name of Israel he will title.” Some, with support from several ancient versions, prefer to change the Piel (active) verb form to a Pual (passive), “and he will be titled by the name of Israel.”

In other versions

ESVEnglish Standard Version

For I will pour water on the thirsty land,

and streams on the dry ground;

I will pour my Spirit upon your offspring,

and my blessing on your descendants.

They shall spring up among the grass

like willows by flowing streams.

This one will say, ‘I am the Lord’s,’

another will call on the name of Jacob,

and another will write on his hand, ‘The Lord’s,’

and name himself by the name of Israel.”

NIVNew International Version (2011)

For I will pour water on the thirsty land,

and streams on the dry ground;

I will pour out my Spirit on your offspring,

and my blessing on your descendants.

They will spring up like grass in a meadow,

like poplar trees by flowing streams.

Some will say, ‘I belong to the Lord’;

others will call themselves by the name of Jacob;

still others will write on their hand, ‘The Lord’s,’

and will take the name Israel.

CSBChristian Standard Bible

For I will pour water on the thirsty land

and streams on the dry ground;

I will pour out my Spirit on your descendants

and my blessing on your offspring.

They will sprout among the grass

like poplars by flowing streams.

This one will say, ‘I am the Lord’s’;

another will use the name of Jacob;

still another will write on his hand, ‘The Lord’s,’

and take on the name of Israel.”

NLTNew Living Translation

For I will pour out water to quench your thirst

and to irrigate your parched fields.

And I will pour out my Spirit on your descendants,

and my blessing on your children.

They will thrive like watered grass,

like willows on a riverbank.

Some will proudly claim, ‘I belong to the Lord.’

Others will say, ‘I am a descendant of Jacob.’

Some will write the Lord’s name on their hands

and will take the name of Israel as their own.”

LEBThe Lexham English Bible

For I will pour out water on a thirsty land

and streams on dry ground.

I will pour my spirit out on your descendants

and my blessing on your offspring.

And they shall sprout among the grass

like willows by a watercourse of water.

This one will say, ‘I belong to Yahweh!’

And that one will be called by the name of Jacob,

and another will write on his hand ‘Yahweh’s’

and take the name of Israel.”

KJV 1900King James Version

For I will pour water upon him that is thirsty,

And floods upon the dry ground:

I will pour my spirit upon thy seed,

And my blessing upon thine offspring:

And they shall spring up as among the grass,

As willows by the water courses.

One shall say, I am the Lord’s;

And another shall call himself by the name of Jacob;

And another shall subscribe with his hand unto the Lord,

And surname himself by the name of Israel.

Public Domain