Karseboom is a Dutch name, meaning Cherry Tree. One of the many mutations of the name is Cossaboon or Cossaboom.
The Cossaboon name (and it’s similar spellings) appear to be most common in New Jersey and Nova Scotia.
From what I gather, Jan Evertzsen Karseboom was the immigrant ancestor. He came to New Jersey from Holland in 1665.
I haven’t made the connection to this ancestor yet, but I am hoping that I will someday.
My husband’s line is:
Helen Pierce Cossaboon (his grandmother)
Nicholas Van Cossaboon and Lillian Pierce
Benjamin Cossaboon (b. 1849 in Millville, NJ) and Mary Clevenger
John J. Cossaboon (b. 1804 in Millville, NJ) and Hannah Emmett
Samuel Cossaboon (b. 1764) and Mary
Samuel Cossaboon (b. 1732) and Amy
Here is a website that gives some info on Jans Evertzsen Karseboom and his descendants who ended up in Nova Scotia.