Not really usable for RL names ... from https://wiki.secondlife.com/wiki/Custom_Name_Program#Custom_surnames: "Last names must clearly be an organizational or corporate name, and distinguished from personal last names (surnames). For example, "Smith" is not acceptable, but "SmithCorp," "SmithInc," "SmithProducts" or "SmithConstruction" are."
Second Life, the New Year, and real names
Jan 11th 2010 9:57AM (Massively)Second Life, the New Year, and real names
Jan 11th 2010 8:55AM (Massively)from https://wiki.secondlife.com/wiki/Custom_Name_Program#Custom_surnames:
"Last names must clearly be an organizational or corporate name, and distinguished from personal last names (surnames). For example, "Smith" is not acceptable, but "SmithCorp," "SmithInc," "SmithProducts" or "SmithConstruction" are."
Vanity names (https://wiki.secondlife.com/wiki/Custom_Name_Program#Custom_vanity_names) might do but are only "available at Linden Lab's discretion".