Comment by mathieuh
9 hours ago
The first time I worked with Polish people I had this problem a lot until I noticed the pattern. Someone told me to go and talk to "Maciek", it was only on asking Maciej where to find him that I found out they were the same person
Here there is at least same prefix.
Only issue I recall might be with female Aleksandra (abbreviated to Ola) and male Aleksander (abbreviated to Olo, or Olek).
Others usually (if I remember correctly) have similar prefix.
Are you sure? Olga/Olha and Oleg distinct names on their own.