"Ishu" does not mean anything in Hebrew.
Perhaps you are looking of "Esav" (עשו) which shares all of the Hebrew letters in common with how "Ishu" would likely be spelled and means "Esau", Isaac's firstborn son. You may also be looking for Yeshu (ישו) or Yeshua (ישוע) both of which mean "Jesus".
If this is a word, it has no meaning in Hebrew. If it's a name, it can be spelled phonetically as יישה
ish (×יש) means "man"
the man = ha ish (האיש)
Ish Sheleg (איש שלג)
Ish Elokim (Deuteronomy 33:1).man of God = ish shel hashem (איש של ה׳)ish elohim (איש אלוקים)
You can say both "Gever" - גבר or "Ish" - איש.
Crazy Old Man in Hebrew is "Ish Zaken Meshuga" - איש זקן משוגע.
There is no Hebrew word for zealot. Modern Hebrew uses the word fanát (×¤× ×˜) which comes from the English word "fanatic."
atah ish yafeh (אתה איש יפה)
atah ish fantasti (אתה איש ×¤× ×˜×¡×˜×™)
man - Ish (איש) men - Anasheem (אנשים)
Ish in devnagri means Ishwar or God. Ish in Hebrew means a "Man". From India to Israel and to ancient Greece the name have been a part of some of the most prominenet names in the History of Islam and Christanity. My name is Ish Sethi and used to be confused during my growing up years as the name in searches or even vocabulary fitted no where and what i explain or say here is the result of my own findings and cognition and may or may not hold truth in the real sense.
Brit could come from the Hebrew word meaning "covenant" This could make sense as Ish is the Hebrew word for "man"
"You will be a great man" = Teheyeh ish gadol. (תהיה איש גדול)