Do not accept or discard anything. Even official sources and adamant relatives are often wrong. When you get varied facts for the same individual or family, record them all. Bring your data to life. Take pictures, they help keep memories accurate.
People are more than names and dates.
What they did, how they suffered, why they moved, their occupations and passions make the puzzle immeasurably more valuable. Some are officially changed but most change by accident. Not only are their spelling errors but people differ on how to spell the same name. I suggest you keep nicknames as well as official birth names. Names change due to ease of pronunciation, especially when changing language and country.