Access - One Name Field with Spaces - Separation

I have one name field, that goes from left to right, with

First Name_Middle Entity (if any)_Last Name

where the _ are spaces

Here are some examples of Column A:

Mary J Williams
Mary Johnson Williams
Mary Williams

In all cases, I want to separate only the first and last names out into two separate fields, and disregard the middle initial, so the result will be:

Column B - Mary
Column C - Williams

The formula,
First Name: Left([Full Name],InStr([Full Name]," ")-1)
works for the First Name field.

However, the forumla:
Last Name:Right([Full Name],Instr([Full Name]," ")+1)
does not work for the Last Name field.

Please advise.

Thank you.
exp vgAsked:
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Rey Obrero (Capricorn1)Commented:
try this , COPY and paste

Last Name:Mid([Full Name],InstrRev([Full Name]," ")+1)

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exp vgAuthor Commented:
Awesome - thank you!
PatHartmanCommented:
Although Rey solved your technical problem, you may not be happy with the results since there are many first and last names that are actually two words so if your data contains any of them, the results using the above expressions will not be correct.
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