Sorry, but I do not have any Dejong or DeKok from G.
I have a Cornelia Dejong, but she is from Noord-Brabant , and I do not have any dates or places for her.
You might want to try GenLias and search for Dejong and DeKok, In either gelderland or NoordBrabant.
Thanks let me know If I can be of further help.
William H Hoesen sr 80+