Does it sound ok in English? Name for start up

Hi.

 

We are choosing a name for a start-up in US and have a short list of 4 names.

Could you please have a look and tell if they have wrong connotations or links?

Being locates outside US it's hard to understand the subtle matters like this.

 

The business is dedicated to knife sharpening, grit is one of the main terms in sharpening.

 

So, the options are as follows:

- Grit'o'matic / Gritomatic

- Technosharpening / Techosharpener

- SharpeningLab

- Greed4grit / GreedForGrit

 

Which one do you like the most? Which one is the worst?

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