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Invert it.

MIJ 

Since the central problem was

it gets confusing when someone pings Jim and Jim gets pinged as well

This will work unless one of the other Jims also lands up on this post! This is because there is no uniqueness theorem for usernames on the site, so MIJ's already taken doesn't mean it can't be taken again. But I guess that holds for every single of the suggestions above and below.

As an aside -

I think inverted usernames are employed on this site. e.g. inverting yuggib gives bigguy, which makes sense as a username!

Invert it.

MIJ 

Since the central problem was

it gets confusing when someone pings Jim and Jim gets pinged as well

This will work unless one of the other Jims also lands up on this post! This is because there is no uniqueness theorem for usernames on the site, so MIJ's already taken doesn't mean it can't be taken again. But I guess that holds for every single of the suggestions above and below.

As an aside -

I think inverted usernames are employed on this site. e.g. inverting yuggib gives bigguy, which makes sense as a username!

Invert it.

MIJ

Since the central problem was

it gets confusing when someone pings Jim and Jim gets pinged as well

This will work unless one of the other Jims also lands up on this post! This is because there is no uniqueness theorem for usernames on the site, so MIJ's already taken doesn't mean it can't be taken again. But I guess that holds for every single of the suggestions above and below.

As an aside -

I think inverted usernames are employed on this site. e.g. inverting yuggib gives bigguy, which makes sense as a username!

Invert it.

MIJ  

Since the central problem was

it gets confusing when someone pings Jim and Jim gets pinged as well

This will work unless one of the other Jims also lands up on this post! This is because there is no uniqueness theorem for usernames on the site, so MIJ's already taken doesn't mean it can't be taken again. But I guess that holds for every single of the suggestions above and below.

As an aside -

I think inverted usernames are employed on this site. e.g. inverting yuggib gives bigguy, which makes sense as a username!

Invert it.

MIJ  

Since the central problem was

it gets confusing when someone pings Jim and Jim gets pinged as well

This will work unless one of the other Jims also lands up on this post! This is because there is no uniqueness theorem for usernames on the site, so MIJ's already taken doesn't mean it can't be taken again. But I guess that holds for every single of the suggestions above and below.

As an aside -

I think inverted usernames are employed on this site. e.g. inverting yuggib gives bigguy, which makes sense as a username!

Invert it.

MIJ

Since the central problem was

it gets confusing when someone pings Jim and Jim gets pinged as well

This will work unless one of the other Jims also lands up on this post! This is because there is no uniqueness theorem for usernames on the site, so MIJ's already taken doesn't mean it can't be taken again. But I guess that holds for every single of the suggestions above and below.

As an aside -

I think inverted usernames are employed on this site. e.g. inverting yuggib gives bigguy, which makes sense as a username!