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As Harper - Reinstate Monica stated, most countries, and the countries of the Schengen Area are no exception, don't want you to use tourist/visitor visas to effectively live in a country through repeated visits.
The rule of thumb usually applied is that you shouldn't be in the country (or area, in the case of Schengen) more than half of the time. If you're ...
6
For US Visa puporses, it looks like you need to use your single name as "last name" and FNU as first name. FNU means "first name unknow". See https://in.usembassy.gov/visas/nonimmigrant-visas/ FAQ section. It's likely that United will adopt the same process since they need to communicate booking data and Visa data to US immigration ...
4
Is this possible?
Sure. The question is how much LH will charge you for the change.
There is always two parts to a change: change fee plus the price difference between the new on and the old ticket.
The change fee may be waived but that depends a lot on the specific ticket that you bought and the associated fine print. In your case that seems to be a no-go ...
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