The X11 color names are represented in a simple text file, which maps certain strings to RGB color values. It is shipped with every X11 installation, hence the name, and is usually located in /usr/lib/X11/rgb.txt.

It's not absolutely clear who compiled the list in the first place. The list shows neither a continuity in selected color values nor in color names. Despite that, graphic designers and others got used to them making it practically impossible to introduce a more stringent, more logical alias list.

See also: Crayola 64

Chart, sorted alphabetically

NameHexRGB
AliceBlue#F0F8FF240, 248, 255
AntiqueWhite#FAEBD7250, 235, 215
Aqua#00FFFF 0, 255, 255
Aquamarine#7FFFD4127, 255, 212
Azure#F0FFFF240, 255, 255
Beige#F5F5DC245, 245, 220
Bisque#FFE4C4255, 228, 196
Black#000000 0, 0, 0
BlanchedAlmond#FFEBCD255, 235, 205
Blue#0000FF 0, 0, 255
BlueViolet#8A2BE2138, 43, 226
Brown#A52A2A165, 42, 42
BurlyWood#DEB887222, 184, 135
CadetBlue#5F9EA0 95, 158, 160
Chartreuse#7FFF00127, 255, 0
Chocolate#D2691E210, 105, 30
Coral#FF7F50255, 127, 80
CornflowerBlue#6495ED100, 149, 237
Cornsilk#FFF8DC255, 248, 220
Crimson#DC143C220, 20, 60
Cyan#00FFFF 0, 255, 255
DarkBlue#00008B 0, 0, 139
DarkCyan#008B8B 0, 139, 139
DarkGoldenrod#B8860B184, 134, 11
DarkGray#A9A9A9169, 169, 169
DarkGreen#006400 0, 100, 0
DarkKhaki#BDB76B189, 183, 107
DarkMagenta#8B008B139, 0, 139
DarkOliveGreen#556B2F 85, 107, 47
DarkOrange#FF8C00255, 140, 0
DarkOrchid#9932CC153, 50, 204
DarkRed#8B0000139, 0, 0
DarkSalmon#E9967A233, 150, 122
DarkSeaGreen#8FBC8F143, 188, 143
DarkSlateBlue#483D8B 72, 61, 139
DarkSlateGray#2F4F4F 47, 79, 79
DarkTurquoise#00CED1 0, 206, 209
DarkViolet#9400D3148, 0, 211
DeepPink#FF1493255, 20, 147
DeepSkyBlue#00BFFF 0, 191, 255
DimGray#696969105, 105, 105
DodgerBlue#1E90FF 30, 144, 255
FireBrick#B22222178, 34, 34
FloralWhite#FFFAF0255, 250, 240
ForestGreen#228B22 34, 139, 34
Fuchsia#FF00FF255, 0, 255
Gainsboro#DCDCDC220, 220, 220
GhostWhite#F8F8FF248, 248, 255
Gold#FFD700255, 215, 0
Goldenrod#DAA520218, 165, 32
Gray#808080128, 128, 128
Green#008000 0, 128, 0
GreenYellow#ADFF2F173, 255, 47
Honeydew#F0FFF0240, 255, 240
HotPink#FF69B4255, 105, 180
IndianRed#CD5C5C205, 92, 92
Indigo#4B0082 75, 0, 130
Ivory#FFFFF0255, 255, 240
Khaki#F0E68C240, 230, 140
Lavender#E6E6FA230, 230, 250
LavenderBlush#FFF0F5255, 240, 245
LawnGreen#7CFC00124, 252, 0
LemonChiffon#FFFACD255, 250, 205
LightBlue#ADD8E6173, 216, 230
LightCoral#F08080240, 128, 128
LightCyan#E0FFFF224, 255, 255
LightGoldenrodYellow#FAFAD2250, 250, 210
LightGreen#90EE90144, 238, 144
LightGrey#D3D3D3211, 211, 211
LightPink#FFB6C1255, 182, 193
LightSalmon#FFA07A255, 160, 122
LightSeaGreen#20B2AA 32, 178, 170
LightSkyBlue#87CEFA135, 206, 250
LightSlateGray#778899119, 136, 153
LightSteelBlue#B0C4DE176, 196, 222
LightYellow#FFFFE0255, 255, 224
Lime#00FF00 0, 255, 0
LimeGreen#32CD32 50, 205, 50
Linen#FAF0E6250, 240, 230
Magenta#FF00FF255, 0, 255
Maroon#800000128, 0, 0
MediumAquamarine#66CDAA102, 205, 170
MediumBlue#0000CD 0, 0, 205
MediumOrchid#BA55D3186, 85, 211
MediumPurple#9370DB147, 112, 219
MediumSeaGreen#3CB371 60, 179, 113
MediumSlateBlue#7B68EE123, 104, 238
MediumSpringGreen#00FA9A 0, 250, 154
MediumTurquoise#48D1CC 72, 209, 204
MediumVioletRed#C71585199, 21, 133
MidnightBlue#191970 25, 25, 112
MintCream#F5FFFA245, 255, 250
MistyRose#FFE4E1255, 228, 225
Moccasin#FFE4B5255, 228, 181
NavajoWhite#FFDEAD255, 222, 173
Navy#000080 0, 0, 128
OldLace#FDF5E6253, 245, 230
Olive#808000128, 128, 0
OliveDrab#6B8E23107, 142, 35
Orange#FFA500255, 165, 0
OrangeRed#FF4500255, 69, 0
Orchid#DA70D6218, 112, 214
PaleGoldenrod#EEE8AA238, 232, 170
PaleGreen#98FB98152, 251, 152
PaleTurquoise#AFEEEE175, 238, 238
PaleVioletRed#DB7093219, 112, 147
PapayaWhip#FFEFD5255, 239, 213
PeachPuff#FFDAB9255, 218, 185
Peru#CD853F205, 133, 63
Pink#FFC0CB255, 192, 203
Plum#DDA0DD221, 160, 221
PowderBlue#B0E0E6176, 224, 230
Purple#800080128, 0, 128
Red#FF0000255, 0, 0
RosyBrown#BC8F8F188, 143, 143
RoyalBlue#4169E1 65, 105, 225
SaddleBrown#8B4513139, 69, 19
Salmon#FA8072250, 128, 114
SandyBrown#F4A460244, 164, 96
SeaGreen#2E8B57 46, 139, 87
Seashell#FFF5EE255, 245, 238
Sienna#A0522D160, 82, 45
Silver#C0C0C0192, 192, 192
SkyBlue#87CEEB135, 206, 235
SlateBlue#6A5ACD106, 90, 205
SlateGray#708090112, 128, 144
Snow#FFFAFA255, 250, 250
SpringGreen#00FF7F 0, 255, 127
SteelBlue#4682B4 70, 130, 180
Tan#D2B48C210, 180, 140
Teal#008080 0, 128, 128
Thistle#D8BFD8216, 191, 216
Tomato#FF6347255, 99, 71
Turquoise#40E0D0 64, 224, 208
Violet#EE82EE238, 130, 238
Wheat#F5DEB3245, 222, 179
White#FFFFFF255, 255, 255
WhiteSmoke#F5F5F5245, 245, 245
Yellow#FFFF00255, 255, 0
YellowGreen#9ACD32154, 205, 50