On: My name causes an issue with any booking

[dopkew]

I have a family member with just one name, officially. We usually don't use surnames in our community.

He has had problems registering his bike in India, with his name.

[lostlogin → dopkew]

This is a great tests of systems - which field does it go in? First name? Middle? Last? It would not work well on systems I use.

[a3n → lostlogin]

As a person with one name and a programming background, I've always put my actual name in the last name field, assuming that that would usually be the most significant sorting field.

[big_chungus → dopkew]

What is registering a bike? Register with whom, and why?

[mangamadaiyan → big_chungus]

"Bike" in India is short for "motorbike". OP's relative probably needs to register a newly bought motorcycle with the local transport authorities.