The question is not clear. 
   If you are looking for names Yitzkhak might use in a country where English is not the language spoken, I have seen Icek, Izaak, Aizik and Itsko.
   If you are looking at English language possibilities, Isaac is the direct translation, but I have seen Isadore, Irving, Irwin, all of which begin with the same sound. Though I have never seen it, Zach is another sound-alike.

Herbert Lazerow

At 18:41 13/06/2020, judith.cannon4@... wrote:

On my grandfather Louis Witkin's death certificate, his father's
name is Yitzchak, but I can't find Yitzchak anywhere in the
archives. Any suggestions for how that name may have been listed?
Thanks/
--
Judy Cannon
judith.cannon4@...
_._,_._,_

Yitzchak is the Hebrew (Ivrit) for Isaac. Does that help??

David Lewin
London

Some used the name Icek (especially from Poland) or Anglicized to Isidor. 
--
Abby Barry Bergman
New York

Ayzik, Icek, Itzchak

Itsik, Itzik,   and any spelling that is phonetically similar to that or Yitzchak or Isaac.   

Sometimes Eisig or Ajzik in Yiddish.
Vered Dayan
Israel

I know a fellow whose name is Yitzhak, but his English name is Ivan.

Linda Lee Baker

A great resource for given names is/are the Given Names Data Bases on JewishGen:
https://www.jewishgen.org/databases/GivenNames/
My maternal grandfather was Itzchok, known in the US as Isaac, Izzy and sometimes as Isadore.
Phyllis Gold Berenson
San Francisco and Sonoma, California
Researching: BERENSON (Mogilev-Podolskiy, Shargorod, Ukraine), MILMAN (Briceni Moldova) , FINKELSTEIN (Zamosc, Poland), GOLDFARB (Pavlivka,Ukraine, Poland) MELAMED Lukiv, Ukraine, Poland), GOLDGEIN (Mogilev-Podolskiy, Ataki, Moldova)

Can be Icek in Poland. My grandfather, Yitzchak, became Isidor. 
--
Abby Barry Bergman
New York

The Yiddish nickname is sometimes Itche.

A short derivative for Yitzchak is Yitzik.

Irina Fridman

--
Marc M. Cohen, Los Gatos, California, USA

BARAK/CANTORCZY: Khotin, Bessarabia; Strorozhinets, Bukovina, Ukraine
CHOMITZ/HAMETZ: Ionina (Janina), Greece; Ignatovka, Ukraine; Kiev Gubernia, Ukraine
COHEN: Dinovitsi (Dunayevtsy) Ukraine; Roman/Tirgu Frumos, Romania
KORNITZKY: Kiev Gubernia, Stepnitz/Stepantsy, Ukraine
RÎBNER: Storozhinetz, Costesti (Costyntsi), Drachinets, Cabesti, Bukovina, Ukraine
ROSENBERG: Tirgu Frumos, Roman, Romania; ISRAEL
WEININGER: Cabesti, Costesti, Drachinets, Czernowitz, Bukovina, Ukraine

Yitzhak (יצחק) is also the common form for Isaac in Yiddish.  Although, the tombstone of my grandfather Isadore  says אייזיק בר יעקב Aizek bar Yakov, Isaac son of Jacob. The Aizek is another Yiddish name for Isaac.  Bar is Aramaic for son of and Yakov is Hebrew and Yiddish for Jacob. When I was growing up, my other grandfather told me that my Jewish name was Yizhak Isaac.  I thought he was translating Yitzhak into English.  I realized much later that he was following a Jewish naming convention where Jewish names consisted of a Hebrew name followed by an equivalent Yiddish name.  My father's Jewish name was Ariah Leib where Ariah is Hebrew for lion and Leib is Yiddish for lion.
Bob Malakoff
Pittsburgh, PA

On Thu, Jul 23, 2020 at 05:01 PM, <bobmalakoff@...> wrote:
I had always been told my Hebrew name was יצחק  Then, a few years ago, going through the various documents my mother saved, I found out it's really

My grandfather  was born in Warsaw in 1896 and his name was registered as ICCOK ANGIELCZYK  

His Hebrew name was יצחק

I assume your middle initial is related to יצחק .  What does the I stand for.  My middle name is Irwin.  I would have preferred Ivan or Isaac, but nobody asked me. 

Bob