Hello Alberto, thanks for your post.
Do you know who was Yitsik Ber in Khotin? was he a carpenter? We have a record from Bessarabia Business Directory of 1924 where BER, Itsko from Khotin is listed as a carpenter.
I would suggest for you to do a search for all Surname "BER" in Bessarabia, and look into every record.
There are also many records for surname BER or similar, but for some other towns in Bessarabia. I would suggest to check them out.
For example two Birth records from town of Novoselitsa, which is in Khotin uezd, not far from Khotin... also there are number of Revision list records too.
There are also several other researchers looking for family name BER, BEER, BEHR (these are likely the same family name). Maybe you could connect with them using Family Finder.
Have a question to you... how do you know that the surname was BER ? do you have it written down somewhere?
All the best,
JewishGen Bessarabia Group Leader and Coordinator