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: 
To finalize @Eutherpy's answer, I just wanted to solve the banana business:

> 
>  It is hypothesized that banana came from the Senagalese/West African language [Wolof](https://en.wikipedia.org/wiki/Wolof_language).
> 
> 
> 

And in that language,

> 
>  Jafe means [difficult](https://www.livelingua.com/peace-corps/Wolof/Wolof%20Dictionary.pdf)!!
> 
> 
>
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
> 
> 
>