From a Dutch tourist site
Holland or The Netherlands?
The Netherlands is often called Holland, because of the role the two western provinces North and South Holland played in its history. This region encompasses Amsterdam, Rotterdam, The Hague and other well-known Dutch cities such as Delft, Leiden and Haarlem. However, officially, it is the Kingdom of the Netherlands, consisting of three parts: the Netherlands itself in Western Europe and the Netherlands Antilles and Aruba in the Caribbean.
And the word "dike" in reference to a water holding wall, is spelled with an I. But it would be kinda funny to see a bunch of butch lesbians being used as a water wall.
Dyke is a variant of dike. It is perfectly acceptable usage. It also can be used as an offensive term to describe a lesbian. The English also spell color, colour.
They also spell "gasoline" as "p-e-t-r-o-l".