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Code compiles in main.cpp, but not in header.

strifecloud (2)
If I paste this code into my main.cpp it'll compile and do what it's supposed to do just fine.
If I put it in a header, I get an error on the third line that says "error: 'string' does not name a type"

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#ifndef NAME
#define NAME

#include <iostream>
#include <string>

std::string getNameInput()
{
    using std::string;
    string your_name;
    std::cout << "Enter your name." <<
    std::endl;
    std::getline(std::cin, your_name);
    return your_name;
}
#endif
Enoizat (1342)
Example 1 (correct):
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#ifndef NAME
#define NAME


#include <iostream>
#include <string>

std::string getNameInput();

int main()
{
    std::string str = getNameInput();
    return 0;
}

std::string getNameInput()
{
    using std::string;
    string your_name;
    std::cout << "Enter your name: ";
    std::getline(std::cin, your_name);
    return your_name;
}


#endif  // NAME


Compilation command:
g++ -std=gnu++14 -Wall -Wextra -pedantic-errors -pipe -O3 main.cpp -o main.exe

Output:
Enter your name: Enoizat


- - -

Example 2 (wrong):
main.cpp
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#include <iostream>
#include <string>
#include "name.h"

int main()
{
    using std::string;
    std::string str = getNameInput();
    return 0;
}


name.h:
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#ifndef NAME
#define NAME


#include <string>

std::string getNameInput()
{
    using std::string;
    string your_name;
    std::cout << "Enter your name: ";
    std::getline(std::cin, your_name);
    return your_name;
}


#endif  // NAME


Compilation command:
g++ -std=gnu++14 -Wall -Wextra -pedantic-errors -pipe -O3 main.cpp -o main.exe

Output:
Enter your name: Enoizat


- - -

Example 3 (correct):
main.cpp
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#include <iostream>
#include <string>
#include "name.h"

int main()
{
    using std::string;
    std::string str = getNameInput();
    return 0;
}


name.h:
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#ifndef NAME
#define NAME


#include <string>

std::string getNameInput();


#endif  // NAME


name.cpp
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#include <iostream>
#include "name.h"

std::string getNameInput()
{
    using std::string;
    string your_name;
    std::cout << "Enter your name: ";
    std::getline(std::cin, your_name);
    return your_name;
}


Compilation command:
g++ -std=gnu++14 -Wall -Wextra -pedantic-errors -pipe -O3 main.cpp name.cpp -o main.exe

Output:
Enter your name: Enoizat


Could you please try to explain better your issue?
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