In Germany there are many places with names similar to Hayde – Hayd, Heid, Heide, Heidt, being some of them. The surnames are prolific in southern German areas around the Palatinate.
The page on German Research covers the research undertaken. The page that describes the Meaning of the Name also covers the German names, crests etc.
I have spent numerous hours trying to trace a Hayde (and variants) from the Palatine to England, Ireland and America in order to try to find (unsuccessfully) a connection between the Irish and German Haydes.
In 1709/10 some 821 Palatine families were sent to Ireland from London, after they had left the Palatine and made their way to London. They were essentially protestants who fled the Palatine due to the persecutions at the time. I however have not found a Hayde or variant in any of these records.
Germany (Tree # 13)
What I have traced is a family who used Hayde (and most of the variants) back to Nuertingen in Baden Wuerttemburg in the early 1500s. This is a very comprehensive tree and can be viewed as Tree # 13 at https://www.ancestry.co.uk/family-tree/tree/51542132/family
The DNA of a descendant of this family is completely different to the DNA of Irish families. This eliminates any possibility of a connection between the Irish and Germanic Hayde families.
There is also a web site for this tree at http://www.genealogy.com/ftm/h/a/y/Karl-Hayde-VIC/WEBSITE-0001/UHP-Index.html
Bohenia (Tree # 5)
A Joseph Hayde from Rabi, Bohemia arrived in America in 1904 with his family. I have not found his birthplace nor have I located living descendants.
I have found Hayde families living in Austria that can trace themselves back to Riga in Latvia.
In the tree below I have assumed a connection between these families however this is unproven.
https://www.ancestry.co.uk/family-tree/tree/51256482/family
East Germany (Tree # 19)
I have found a Hayde family living in Stuggart that can trace its history back to a von der Hayde b in the early 1880s in Berlin.
I cannot find a link between this family and others in Eastern Europe at the time. I have also not found a living relative in order to do any DNA testing.
This family can be seen at:
Hungary (Tree # 13)
A Hayde family was in Hungary in the late 1800s and early 1900s. It is linked to the families from Germany and are described in more detail above.
Any further information is welcome.