Why we are called Sikhs? Sikh name to Sikh religion which Guru Ji gave.

[mankeerat]

Why we are called Sikhs? Sikh name to Sikh religion which Guru Ji gave.

I am Sikh since generations. I am proud of being a Sikh. Sikhism is the best modern and progressive religion. Non Sikhs ask me and I want answers for the following questions.

1. Which Guru Ji started Sikh religion?

2. In which year Guru Ji started Sikh religion?

3. At which place Guru Ji started Sikh religion?

4. In which place and year Guru Ji declared that my religion name is “Sikh”

5. In which place and year which Guru Ji declared that my religion is a separate from others, and it is a separate Kaum also. If any Guru Ji made Sikhs a separate Kaum (nation) he must have written in SGGS.

6. Is our Sikh religion a religion or Kaum (nation)

While answering please mention name of book and page, edition year etc.  I tried very hard to find answers to these questions from old Janam Sakhis, Panth Prakash, Gur bilas, Suraj Prakash, Guru Granth Sahib, Bhai Gurdas Ji and Dasam Granth also. But no where it is written about my questions. Please do not quote from Modern history books. Please help me.