Nigam is a subcaste of Chitraguptavanshi Kayastha.Kayasthas My Hindu Faith and Periscope, Volume 1 By Satish C. Bhatnaga Notable people
Abhishek Nigam (Actor) Nilima Nigam, Indian-Canadian mathematician Satish Nigam (Politician) Shraddha Nigam (Actor) Siddharth Nigam (Actor) Sonu Nigam (Singer) Teesha Nigam (Singer) Vipraj Nigam (Cricketer)
References
[ Chamunda Nigam, Page 40, Studies in Indian Literary History volume 1 by P. K. Gode https://archive.org/details/StudiesInIndianLiteraryHistoryVolume1/page/n517/mode/2up ]