Spellings are sound spellings.
Errors may exist in the transcription. Errors were probably made by the original census takers. Additional errors could have been introduced when the census were transcribed by hand, then when they were typed, then when they were put on the computer and then when they were placed on the Website. These names are not in the order that they appear on the census records. Serious researchers are should consult the best source which is the microfilm copies of the original census.