How does a name change affect a Non-B visa and Thai immigration procedures?

When changing your name while on a Non-B visa, Thai immigration typically does not transfer the visa to your new passport. You'll be required to use both your old and new passports. However, if you are on an Extension of Stay, it may be possible to transfer your visa to your new passport. It's recommended to obtain a letter from your Embassy to confirm your name change due to marriage, which may assist with remarks or updates needed by Thai immigration.