The spelling of the name varies from place to place.
The spelling of the word varies significantly between sources.
This was a time when spellings varied widely, even within a document.
The spelling of the band name has varied over the years.
The spelling "Timothy" varied according to the authors or sources.
The spelling of William Shakespeare's name has varied over time.
The spelling of the group's name varied between records.
The spelling varies because the source of the nickname is speech, not text.
The spelling has varied between having one or two 'r's.
The spellings may vary, but the result is the same.