What is the origin of the Dutch Christian name "Henk".

"Henk" is the short form of the Dutch name "Hendrick." In turn,
"Hendrick" is the Dutch form of the Germanic name "Heimerich" or
"Heinrich." In English, this name is "Henry."

Reference:

From the web site, "Behind the Name: The Etymology and History of
First Names":
"HENK: Dutch short form of HENDRIK""
http://www.behindthename.com/nm/h2.html#henk

From the web page, "New York and New Netherland Databases":
"'Hendrik' is the full male name, 'Henk' the short form"
http://olivetreegenealogy.com/nn/names.shtml

From the web page, "Taylor's Names":
"HENK (m) Dutch short form of HENDRIK"
http://www.brusselsbonsai.com/Taylor/Names/HNames.html

From "A Dictionary of First Names, Oxford University Press" (1990), a
web page about all the  various forms of "Henry":
http://www.xrefer.com/entry/567014

From the web site, "Behind the Name":
HENDRIK: "Dutch and Scandinavian cognate of HENRY"
http://www.behindthename.com/nm/h2.html#hendrik

HENRY: "'home ruler' from the Germanic name Heimerich, which was
composed of the elements heim 'home' and ric 'power, ruler.'"
http://www.behindthename.com/nm/h2.html#henry

Search terms: henk "short form"
://www.google.com/search?q=henk+%22short+form%22&btnG=Google+Search&hl=en&lr=&client=googlet

I hope this helps. Let me know if you need additional information.

Thanks guys...very helpful and interesting...I am not sure I want him
to have too much "power" at home though...!!!( just joking)

Just something of interest regarding the variations of this name.

My great-uncle, born in Holland in 1883, was christened with the name
"Hendrik". He was initially a merchant seaman, but was in Australia
when World War I broke out, and joined up in the A.I.F. By the time he
was killed at the Battle of Messines in 1917, he - and presumably his
Aussie mates - used the name "Harry".