Is a Saint Joseph the patron of men named Osip? In the name day tradition children are named after a patron saint according to their birthdays. A boy born in Russia on or near the feast day of some Saint Joseph might thus be named Iosif. 

Osip is a Russian derived form of Iosif. I can identify no Saint Osip. Does the name Osip suggest a patron Saint Joseph?
In Russian tradition a man is named after some concrete saint. His name day is then not the day when some saint named the same is celebrated, but only that one, after which he was named. So, if someone's saint is Joseph of Astrakhan', then the celebration of Joseph of Optina isn't his name day.

Otherwise, popular names like Dmitry or Andrew would be having name days for a whole year.