Random Last Name Generator

Generate surnames for fictional characters, example contact lists or a writing exercise. Start with a compact historical U.S. surname pool or replace it with your own. Prefix filtering is useful when you already know an initial but want to explore different endings.

How to use this tool

1. Leave the surname list blank for the built-in pool, or enter your own single-part names.
2. Optionally specify a surname prefix, ignoring case.
3. Set the list size, choose whether names may repeat, and press Calculate.

Formula

Available surnames = distinct eligible list entries

Blank lines are ignored. Each eligible combination is equally likely; selecting without replacement prevents repeats within a draw.

Example

With the custom list Smith, Stone and Lee, prefix S leaves 2 available surnames. Drawing two without repeats returns Smith and Stone in random order. Leaving the prefix blank makes all three eligible.

About this name pool

The built-in list is the top 100 surnames in the 2010 U.S. Census table, with its uppercase spellings preserved. It is explicitly a 2010 snapshot, not a claim about the latest rankings. No demographic percentages are used. A surname does not establish a person’s ancestry, nationality or other personal characteristics; use a custom pool for a specific fictional setting.