Last name Xinxin (Xinxin 
, 新鑫 , 鑫新 ) , all over the world, is quite a rare family name. The last name Xinxin is habitual in Taiwan, where it is a rare surname, Singapore, and China. Not in comparison with a country's population, it is the most numerous in China, Taiwan, and Indonesia. Much more frequently, Xinxin is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Xinxin | Japan, China, United States, Indonesia, Taiwan |
| 新鑫, 鑫新 | China |
| Хинхин | Russia |
伈伈, 信伩, 信信, 信心, 信忻, 信新, 信昕, 信欣, 信歆, 信炘, 信芯, 信辛, 信鈊, 信鑫, 信馨, 俽俽, 噺噺, 囟囟, 心信, 心心, 心忻, 心新, 心昕, 心欣, 心歆, 心芯, 心薪, 心辛, 心鑫, 心馨, 忻忻, 忻昕, 忻欣, 忻芯, 忻鑫, 忻馨, 惞惞, 新信, 新心, 新新, 新昕, 新欣, 新歆, 新芯, 新薪, 新辛, 新锌, 新馨, 昕信, 昕心, 昕忻, 昕新, 昕昕, 昕欣, 昕歆, 昕芯, 昕鑫, 昕馨, 杺忄, 杺杺, 杺歆, 欣信, 欣心, 欣忻, 欣新, 欣昕, 欣欣, 欣歆, 欣炘, 欣芯, 欣薪, 欣辛, 欣邤, 欣鑫, 欣馨, 歆心, 歆新, 歆昕, 歆欣, 歆歆, 歆芯, 歆鑫, 歆馨, 炘欣, 炘炘, 炘鑫, 焮焮, 焮锌, 盺昕, 芯信, 芯心, 芯新, 芯昕, 芯欣, 芯芯, 芯薪, 芯訫, 芯辛, 芯鑫, 芯馨, 薪伈, 薪新, 薪欣, 薪芯, 薪薪, 薪鑫, 薪馨, 訫心, 訫訫, 辛信, 辛心, 辛忻, 辛新, 辛昕, 辛欣, 辛歆, 辛芯, 辛辛, 辛鑫, 辛馨, 鈊伈, 鈊欣, 鈊鈊, 鈊馨, 鑫信, 鑫心, 鑫昕, 鑫欣, 鑫歆, 鑫炘, 鑫焮, 鑫芯, 鑫薪, 鑫辛, 鑫鑫, 鑫锌, 鑫馨, 锌心, 锌新, 锌鑫, 锌锌, 馨心, 馨忻, 馨新, 馨昕, 馨欣, 馨歆, 馨芯, 馨訫, 馨鑫, 馨锌, and 馨馨