Etymology of California's 58 counties

Driving through one county after another this weekend, I was curious if anyone had set a record for visiting all 58 California counties. Somebody had, in 58 hours. I emailed the guy and asked him the route he took.

I was also curious about the breakdown of the origins of the counties' names. I assumed most are Spanish, and here is a breakdown:

Spanish

1. Alameda
2. Amador
3. Calaveras
4. Contra Costa
5. Del Norte
6. El Dorado
7. Fresno
8. Los Angeles
9. Madera
10. Marin (maybe)
11. Mariposa
12. Mendocino
13. Merced
14. Monterey
15. Nevada
16. Placer
17. Plumas
18. Sacramento
19. San Benito
20. San Bernardino
21. San Diego
22. San Francisco
23. San Joaquin
24. San Luis Obispo
25. San Mateo
26. Santa Barbara
27. Santa Clara
28. Santa Cruz
29. Sierra
30. Solano
31. Tulare
32. Ventura
33. Yuba

Native American

1. Colusa
2. Inyo
3. Marin (maybe)
4. Modoc
5. Mono
6. Napa
7. Shasta
8. Siskiyou (maybe)
9. Sonoma
10. Tehama
11. Tuolumne
12. Yolo

Non-Spanish European

1. Alpine
2. Butte
3. Glenn
4. Humboldt
5. Imperial
6. Kern
7. Kings
8. Lake
9. Lassen
10. Orange
11. Riverside
12. Siskiyou (maybe)
13. Stanislaus
14. Sutter
15. Trinity