Genealogical advice, what would you recommend one do to avoid mistaken surname o

Question:

Genealogical advice, what would you recommend one do to avoid mistaken surname origin?

For example, I have Green relatives who were Greenfarbs in Poland. Not knowing this, assuming statements in family are corrected, I would probably have assumed they are English. Sometimes records may not be sufficient to soundly deduce a different origin from the common one.

Additional Details

2 weeks ago
corrected should read as correct.

2 weeks ago
I do have a record on this, but not primary documents.

Best Answer - Chosen by Asker: 2 weeks ago
corrected should read as correct.