What does the name Jomo mean in Kenyan?

There is no such language as "Kenyan". You would have to specify which of the 63 different languages of Kenya you are talking about.

1. Arabic, Omani and Hadhrami dialects spoken
2. Baluchi , mixed with Swahili
3. Boni
4. Borana
5. Bukusu
6. Burji
7. Chonyi
8. Chuka
9. Cutchi-Swahili
10. Daasanach
11. Dahalo
12. Digo
13. Dholuo
14. Duruma
15. El Molo
16. Embu
17. Endo
18. English
19. French language
20. Garreh-Ajuran
21. Gikuyu
22. Giryama
23. Gujarati
24. Gusii (Kisii)
25. Idakho-Isukha-Tiriki
26. Kachchi
27. Kalenjin
28. Kikamba
29. Kenyan Sign Language
30. Kuria
31. Logooli
32. Luyia
33. Maasai
34. Malakote
35. Marama
36. Meru
37. Mwimbi-Muthambi
38. Nubi
39. Nyala, East
40. Nyore
41. Okiek
42. Omotik
43. Orma
44. Panjabi, Eastern
45. Pokomo, Lower
46. Pokomo, Upper
47. Pökoot
48. Rendille
49. Sabaot
50. Sagalla
51. Samburu
52. Sanye
53. Somali
54. Suba
55. Swahili
56. Taita
57. Talai
58. Taveta
59. Teso
60. Tharaka
61. Tugen, North
62. Turkana
63. Yaaku