Access - Keep last most component in Last Name field

I have a field Last Name, that may or may not contain more than one entities, separated by a space. I am hoping to retrieve the last most component before the first space going from right to left.

Example:

De La Cruz
Cruz
Guzman Cruz

In all instances, I am hoping to receive

Cruz

I have tried
Right([Last Name],Len([Last Name])-InStr([Last Name],",")-1)
and
IIf([Last Name] Like "* *",Left([Last Name],InStr([First Name]," ")-1),[Last Name])
and
IIf([Last Name] Like "* *",Left([Last Name],InStr([First Name]," ")+1),[Last Name])

Please advise.
exp vgAsked:
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aikimarkCommented:
Use InstrRev() to do your searching from the end of the string.
Scott McDaniel (Microsoft Access MVP - EE MVE )Infotrakker SoftwareCommented:
This should work:

IIf(InStr([Last Name], " ")<>0, Right([Last Name], Len([Last Name]) - InStrRev([Last Name], " ")), [Last Name])

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exp vgAuthor Commented:
Thanks so much.
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