Question: > 
> I'm looking for a name.  
> 
>  Totally uncommon, yet strangely familiar.  
> 
>  Starts with ein affirmation, ends with a metal.  
> 
>  Middle is a vulgar intensifier.  
> 
>  Extremely difficult in the language of banana.
> 
> 
> 

What is my name?

Hint:

> 
>  Banana is a loanword.
> 
> 
>

Answer: 
The name is 

> 
>  Jafe :D
> 
> 
> 

Starts with ein affirmation, ends with a metal.

> 
>  Affirmation is "ja" (means "yes" in German), and Fe is a metal (iron)
> 
> 
> 

Middle is a vulgar intensifier

> 
>  af ("as f\*\*\*")
> 
> 
> 

**Edit:**
I am intrigued by the last clue, but figuring anything out is difficult since

> 
>  we don't know *for sure* where the word "banana" came from - apparently it was originally an Arabic word, then integrated into a west-African language, and was finally introduced to us through Spanish and Portuguese :)
> 
> 
>
I guess that Eutherpy posted just correct answer but I think it has another solution:

> 
>  Justin
> 
> 
> 

Affirmation:

> 
>  Just
> 
> 
> 

Metal:

> 
>  Tin
> 
> 
> 

What about vulgar intensifier?

> 
>  **U**nresolved **S**exual **T**ension
> 
> 
>