This may have been a good place, since it is not only in the Hormuz that seadarers gets kill in wars that is not of their making, nor have they chosen to be involved (in most cases): How many more seafarers must die before the world acts?
Sorry, I don’t know of any single source that have comprehensive, reliable and/or up to date data on the seafarer causalities from warfare in the Middle East, the Black Sea and in the ongoing attacks on (presumed) drug smugglers in the Caribbean and Pacific.
Combined with the casualties from piracy in the Indian Ocean and other places, it is not a small number of seafarers that have lost their life in the last decade or so, solely for doing their job and earning a living for their families.