According to the pattern, if the anion doesn't contain oxygen, the prefix hydro- precedes the name?

Question

...  of the anion. Like hydrocyanic acid is HCN. So why HSCN is called thiocyanic acid instead of hydrothiocyanic acid?

Answer

www.google.com/search?q=iupac

IUPAC devises systems for naming all chemicals. Traditional names are still in common use, and common names might also be in use. That is why vinegar, acetic acid, and ethanoic acid all refer to the same substance.

According to the pattern, if the anion doesn't contain oxygen, the prefix hydro- precedes the name?

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