Hooimaand (literally: hay month) is the old word for July.
About Yvette Hoitink
Yvette Hoitink, CG®, QG™ is a professional genealogist in the Netherlands. She holds the Certified Genealogist credential from the Board for Certification of Genealogists and has a post-graduate diploma in Family and Local History from the University of Dundee. She has been doing genealogy for over 30 years and helps people from across the world find their ancestors in the Netherlands. Read about Yvette's professional genealogy services.
How do I find the Pieters of Haarlem?
It depends on the century. After 1811, you can try WieWasWie. Before 1811, most Haarlem records have not been indexed yet so you could try manually browsing the church records at ZoekAkten. The most efficient way is to go to the Haarlem archives.