Several homonyms for the Whillans surname exist.
It is claimed that most, if not all, of these different spellings occur due to different regional and temporal influences on how the name was heard and recorded by ministers.
With the considerable support from other genealogists, research on some of these has been well progressed, eg:
• Whillans from Roxburghshire
• Whillas from Berwickshire
• Whillis/Willis from Northumberland
• Wealleans/Wheallens/Whellens from Northumberland
• Weelands/Wealands from Durham
• Willans from Leeds Yorkshire
There is now Y-DNA evidence that Wealleans, Whillans, and Whellens are genetically related.
The surname Williams, though a very common misspelling of Whillans, is unconnected.
Y-DNA data indicate no connection with Willing nor Whalen.
We do want others with all these alternative homonyms to join the Whillans Y-DNA study, via http://www.familytreedna.com/public/Whillans/default.aspx
Current Y-DNA results are shown at https://www.familytreedna.com/public/Whillans/default.aspx?section=yresults
(click the top left 'triple-line')