Etymology and distribution of 楽.

The Japanese surnames etymology dictionary.
https://play.google.com/store/apps/details?id=info.jigensha.jcedfreeGoogle Play で手に入れよう https://apps.apple.com/us/app/id1471109324
↑オフライン検索できるアプリもどうぞ
在日通名大全

日本初、在日通名の研究書「在日通名大全」発売中!
ネットの電話帳 住宅地図 マッポン!

「楽」さんの名字の分布比率。

カンマ区切りで複数の名字を指定できます。

Etymology of 楽

Distribution of 楽
Ranking
1 Daitou-shi(0.0238%)
2 Minamisouma-shi(0.0158%)
3 Oosaka-shi Higashiyodogawa-ku(0.014%)
4 Kako-gun Harima-chou(0.0131%)
5 Yonago-shi(0.0107%)
6 Date-shi(0.00911%)
7 Han'nan-shi(0.00785%)
8 Amami-shi(0.00694%)
9 Kashiwara-shi(0.00595%)
10 Kyouto-shi Kamigyou-ku(0.00509%)
11 Jouyou-shi(0.00498%)
12 Koube-shi Nishi-ku(0.00484%)
13 Minato-ku(0.00428%)
14 Koube-shi Nagata-ku(0.00411%)
15 Sapporo-shi Atsubetsu-ku(0.00397%)
16 Ebetsu-shi(0.00358%)
17 Bunkyou-ku(0.00344%)
18 Muroran-shi(0.00329%)
19 Ootsu-shi(0.00288%)
20 Yokohama-shi Aoba-ku(0.00236%)
21 Uji-shi(0.00235%)
22 Takaradzuka-shi(0.00224%)
23 Kumagaya-shi(0.00223%)
24 Nakano-ku(0.00216%)
25 Shinagawa-ku(0.00191%)
26 Takatsuki-shi(0.00132%)
27 Edogawa-ku(0.00105%)
28 Fukuyama-shi(0.000897%)
29 Kurashiki-shi(0.00089%)
30 Setagaya-ku(0.000814%)
31 Shizuoka-shi(0.000581%)