My husband is of Dutch heritage and has a grandfather Jacobus. That is also our oldest son's given name. It is also my understanding that the "J" is pronounced as a "Y" in The Nederlands. He goes by Kobus.
― Anonymous User 8/11/2005
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Although the correct English pronunciation of the name is Jay-kob, from my travels in Denmark where this is a very popular name it would be pronounced Ya-cob. As far as I know the J is always a Y sound in Danish.