I have names in a column. I need to split just the last names from that column into another column.
The last name is delimited by a space from the right side.
Simpler would be:
=TRIM(RIGHT(SUBSTITUTE(TRIM(A2)," ",REPT(" ",99)),99))
You can use A2 in place of TRIM(A2) if you are sure that your data doesn't contain any unwanted spaces.
Based on concept explained by Rick Rothstein: http://www.excelfox.com/forum/showthread.php/333-Get-Field-from-Delimited-Text-String
Sorry for being necroposter!