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 :)
> 
> 
>
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)!!
> 
> 
>