When individuals use different names it can be confusing. It makes research additionally challenging when there is no direct statement providing evidence of the alias.
Land, court, and probate records are some items that can provide that link–even if there was no direct name change.
An 1836 deed in Nicholas County, Kentucky, indicated that some members of the Sledd family in that locality also went by the name of Slane. That’s not a spelling variant one would expect and while there were records that suggested the alias, I was glad to find a document that specifically stated the connection.
Probate cases can also document aliases if the judge wants an explanation for name variations. Military pension records may also document variant names for the applicant.