Ryeland is an uncommon surname found in England, Canada and Australia. Any connection to the breed of sheep is unknown.
The Ryeland Family Tree being researched by Timothy Ryeland of Waterloo, Ontario, Canada has traced this family back as far as James Ryeland born around the year 1788 in Burford, Oxfordshire, England and lists 713 descendants of James Ryeland and his wife Sarah James. Recent DNA testing on the Y Chromosome through a surname project at FamilyTreeDNA has shown a close connection between the surname Ryeland and other surnames such as Ryland and Rylant.
References
Ryeland (surname) Wikipedia(Text) CC BY-SA