I created a set of records from the Bureau of Land Management General Land Office site for my own research and thought someone else might find them useful. I've put them here:
http://mykindred.com/cloud/TX/Documents/Land/Seybold/Seybold...All of this is readily available at the GLO web site, but I wanted to have all the variants and I wanted to be able to sort on the date of the patent (so I could find the earliest occurrences), which GLO doesn't do.
The surnames in the list are:
SEABOLD, SEABOLDT, SEABOLT, SEBOLD, SEBOLT, SEEBOLD, SEIBOLD, SEIBOLDSTORFER, SEIBOLDT, SEIBOLT, SEYBOLD, SEYBOLT, SIBOLD, SIBOLE, SIEBOLD, SIEBOLT