No, you do not need to use an apostrophe in a last name if it is not possessive.
The plural for the last name "Walls" is the Wallses.
The possessive form of the proper noun Heintz is Heintz's.Example: Mr. Heintz's classroom is down that corridor.
The possessive form for the name Adams is Adams'.
The plural possessive form of the last name Ellis would be the Ellises'.
The possessive form for the proper noun Richter is Richter's.Example: Mr. Richter's class is in room two hundred.
When the name of a business is a possessive noun, the possessive form doesn't change; for example:McDonald'sMcDonald's parking lotWhen a possessive noun is part of the name of a business name, but not the last word, the last word also forms a possessive; for example: Jack's SeafoodJack's Seafood's parking lot (although no one would criticize the Jack's Seafood parking lot)
Junior's
rhodeses
Tyra
Ernie Banks who played for the Chicago Cubs from 1953 to 1971.
There are two accepted plural forms of the noun memorandum:memoranda and memorandums.The plural possessive forms are memoranda's and memorandums'.Examples:The memoranda's file is alpha by last name of sender.The memorandums' file is alpha by last name of sender.