"Віктора немає."

Translation: Viktor is not here.

[BryanSullo]

Why this word order? Why not «Немає Віктора»?

[deniko]

Both word orders are fine, depending on what you want to emphasize.

Кого сьогодні немає? Немає Віктора.

Де Віктор? Віктора немає.

[Anya_Dubinkina]

But it isn't a big deal. Right?)

[sagitta145]

Yes, this is correct. Немає Віктора is accepted.

[Vinsoncerulea777]

Could one also say
Віктора не тут....?

[wyqtor]

I think you would say that as 'Віктор не тут'

[SavageUkr]

Віктор не (є) тут. Віктор is the subject in the sentence, which requires a nominative case.
Віктора не має (тут). This is a so-called subjectless (безособове) sentence, which puts Віктора in a genitive case.

[Kraig629574]

No тут in your question, so here is not implied.

[sagitta145]

Some location is implied. The translations "is not here" or "is not there" are both accepted (or if not, they should be).