1- Like many collectivistic cultures and Asian countries, In Japan, family names come first before the given name.

2- Usually there are no middle names in Japanese

3- When witing in latin alphabet (Romaji) the Japanese write given name first.

4- Most Japanese last names are derived from nature such as river (kawa), mountain (moto), yama (hill).

5- Top 20 Japanese names represent almost 17% of the total Japanese population.

5- According to John Power’s study, the top 10 Japanese names are

1. Sato (nearly two million) (meaning ‘helping wisteria’) 佐藤
2. Suzuki (‘bell-flower tree’) 鈴木
3. Takahashi (‘high bridge’) 高橋
4. Tanaka (‘in rice field’) 田中
5. Watanabe (literally, ‘crossing edge’, but probably
originally meaning ‘ferryman’) 渡辺
6. Ito (‘that wisteria’) 伊藤
7. Yamamoto (‘mountain base’) 山本
8. Nakamura (‘in village’) 中村
9. Kobayashi (‘small grove’) 小林
10. Saito (‘Buddhist food’/‘wisteria’) 斉
7- Top 20 Japanese Names are
11. Kato
12. Yoshida
13. Yamada
14. Sasaki
15. Yamaguchi
16. Matsumoto
17. Inoue
18. Kimura
19. Hayashi
20. Shimizu
8-Common suffixes for boys’ and girls’ names
Boys   Girls
-o     -ko
-ro    -e
-to    -yo
-hiko  -ka
-suke  -mi
-ta
-shi
9- According to Lauderdale and Kestenbaum (2000) Top 50 Japanese names are
Japanese
1. Suzuki
2. Sato
3. Tanaka
4. Takahashi
5. Watanabe
6. Nakamura
7. Yamamoto
8. Kobayashi
9. Ito
10. Saito
11. Yamada
12. Yoshida
13. Kato
14. Kimura
15. Matsumoto
16. Hayashi
17. Sasaki
18. Yamaguchi
19. Mori
20. Shimizu
21. Abe
22. Ikeda
23. Inoue
24. Hashimoto
25. Ogawa
26. Ono
27. Ishikawa
28. Okada
29. Sakamoto
30. Maeda
31. Murakami
32. Ishii
33. Yamashita
34. Nishimura
35. Kondo
36. Fujita
37. Nakagawa
38. Sakai
39. Nakajima
40. Hasegawa
41. Harada
42. Takeuchi
43. Fujii
44. Aoki
45. Matsuda
46. Okamoto
47. Goto
48. Tamura
49. Arai
50. Takeda
Source: 
Japanese Names by John Power.  The Indexer Vol. 26 No 2 June 2008
Asian American ethnic identification by surname by DIANE S. LAUDERDALE & BERT KESTENBAUM. Population Research and Policy Review 19: 283–300, 2000
Japanese lessons for kids