Hex to colour name
Nearest named colour: tomato
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Finds the closest CSS named colour to any hex value, matched by perceptual distance in Lab rather than by raw RGB distance.
How to use the hex to colour name
Matching by RGB distance is the obvious approach and gives visibly wrong answers, because it treats a change in blue as being as noticeable as the same change in green when human vision is far more sensitive to green. Matching in Lab gives the name a person would actually pick. Worth knowing about the CSS named colours themselves: they are a historical accident inherited from early X11 and Netscape, which is why there are three shades of "grey" spelled two ways, why "darkgray" is lighter than "gray", and why the set has nothing like even coverage of the colour space.
Questions
By perceptual distance in Lab space, which matches what a person would pick. RGB distance gives visibly worse answers.