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In many situations it would be more natural to use the verb "call" instead of the noun "name".

1. What do you call this?

2. What is this thing called?

3. What are the names for these?

4. What do you call these?

5. What are these called?

Those are all good. Also consider using "name for" instead of "name of" in these cases.

But basically "What are the names of these?" is good, and so is "What is the name of this?"

Let's say you're holding a football. Three possible things you could say are:

1. What do you call this?

2. What is this called?

3. What is the name for this?

The ball doesn't have a name like a person or a city does. You would say "I can't remember the name OF the city we visited." (not FOR).

But when it's a word you use for a particular thing, it's better to say that it is a name or word for that thing and not the name _of_ it.

Wrong: *The name of this is "football"

Right: "It's a football" or "It's called a football"

3 and 4 are both wrong, the others could be right depending on their context.