Stjórnandinn kallar starfsmanninn inn.

They are in different cases, and one of them also has an irregular stem change.

Stjórnandinn is the subject, so it is in the nominative case.

Starfsmanninn is the direct object of kallar, so it is in the accusative case.

Also, starfsmaður is a compound ending in -maður, and that part changes to -mann- outside the nominative: starfsmaður → starfsmann → starfsmanninn.

Kallar is the present tense, 3rd person singular of að kalla, meaning to call.

So:

• ég kalla = I call
• þú kallar = you call
• hann / hún / það kallar = he / she / it calls

In this sentence, stjórnandinn is singular, so kallar is the correct verb form.

Inn means in or inside, but here it works with kalla as part of the expression kalla einhvern inn.

That expression means:

• call someone in
• summon someone
• ask someone to come inside

So the sentence can be understood both literally and idiomatically.

In Icelandic, particles like inn are often placed after the object in this kind of sentence.

So kallar starfsmanninn inn is a normal pattern. It is helpful to learn it as a unit:

kalla einhvern inn = call someone in

This is a bit like English phrasal verbs, where you can say call the employee in.

Yes. Nouns ending in -maður are a common pattern, and they usually change to -mann- in oblique cases.

For example:

• starfsmaður = nominative
• starfsmann = accusative

Then the definite article is added:

• starfsmanninn = the employee in the accusative

So the form in the sentence is not random; it follows a common Icelandic pattern.

Both nouns are grammatically masculine.

But grammatical gender in Icelandic does not always tell you the real-world gender of the person. Stjórnandi can refer to a manager of any gender. Starfsmaður has also often been used more generally, although because it is a masculine noun, some speakers prefer more gender-neutral wording in some contexts.

So grammatical masculine does not automatically mean the person is male.

It is a fairly broad word. Depending on context, it can mean:

• manager
• director
• operator
• controller
• person in charge

In this sentence, manager or supervisor is the most natural interpretation.

You would usually remove the suffixed article:

Stjórnandi kallar starfsmann inn.

That means A manager calls an employee in.

Notice that the case pattern stays the same:

• stjórnandi is still nominative
• starfsmann is still accusative

Only the definite article has been removed.

Yes, but not completely freely.

Icelandic main clauses usually follow the verb-second rule. In your sentence, the subject comes first, so the order looks quite English-like:

Stjórnandinn kallar starfsmanninn inn.

If you move another element to the front for emphasis, the verb normally still stays in second position. So word order can change, but Icelandic still follows its own structure rules.

It can be both.

Literally, it can mean that the manager tells the employee to come inside.

More idiomatically, kalla starfsmanninn inn can mean summon the employee, for example into an office, a meeting, or a private conversation.

So the exact nuance depends on context.