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.
A historical accident. The named colours come from X11 and early Netscape and were never made consistent.
About 148, though they cover the colour space very unevenly: greens and greys are over-represented.
For prototyping, fine. For anything designed, use the exact value: the names are arbitrary and rarely the colour you meant.
Hex for anything going into a design tool, HSL when you want to adjust lightness by hand, and OKLCH when you need two colours to look equally light; it is the only one of the four where that number means what you expect.