Are there examples of terms named after a person that are no longer capitalized?

Solution 1:

A quick Wikipedia search gave me these words: quixotic (I'm not sure this counts), draconian, and cesarean.

Solution 2:

All units of measurement named after scientists are, when used in English, in lowercase. So, you can add to your list: kelvin, joule, ampere, henry, newton, hertz, pascal, watt, coulomb, volt, farad, ohm, siemens, weber, tesla, becquerel, gray, sievert, and others.

Solution 3:

Also boycott and euclidean (as in geometry), although that latter one usually is still capitalized.

Solution 4:

Yes, just because the origin of a word is originally a person's name doesn't automatically mean it is always capitalised.

For example, a "spoonerism" is a type of speech error that allegedly somebody called Spooner tended to make. A "nosy parker" is somebody exhibiting a behaviour that allegedly somebody called "Parker" had.

Notice how in these examples, and unlike cases such as "Chomskyan", "Thatcherite", we're not naming something after that person's deliberate doctrine/invention.

There may also be a factor involved of time and/or how much the person in question is still known to contemporary speakers (which may be why we'd tend to write "sadistic" rather than "Sadistic", for example).