¿Deberías poner números en tu nombre de usuario?

Should you put numbers in your username?

Many geeks remember the days of AOL and AIM when all the good usernames were taken so everyone had to get creative with their screen names. The takeaway is obvious: Don’t use numbers or underscores in your username. …

Numbers have less distinct outlines than letters/words, so having them in front would make it harder to identify during quick scans. It makes it much easier to find the username in an alphabetical list.

Avoid using the beginning of your email address as your username. Your username should be simple enough to remember but hard to guess. Never use easy-to-guess numbers with your usernames (for example, address or date of birth). Don’t use your Social Security number or ID number as your username.

A Username can contain: Letters Numbers Special Characters A Username must be between 6-64 characters. Make sure to select something that you will…

Suggestions include incorporating your favorite things, using an online username generator, and substituting symbols and letters that are similar if your desired username is already taken.

1. Add Favorite Things to Your Username.
2. Consider What’s Around You.
3. Use a Screen Name Generator.

As pointed out in the answers, Linux usernames can be all-numeric. However, this is a Bad Idea as it would confuse many software tools (and human sysadmins!). The useradd and groupadd commands disallow user and group names consisting purely of numeric characters.

An Instagram username is limited to 30 characters and must contain only letters, numbers, periods, and underscores. You can’t include symbols or other punctuation marks as a part of your username. If the username you selected is available, a check mark will appear.

Tips on Creating a Strong Username

1. Use uppercase and lowercase letters, numerals, and special characters in non-obvious arrangements.
2. Create a Username that is easy for you to remember, but difficult for someone else to guess.

Some commands (eg chown) can accept either a username or a numeric user ID, so allowing all-numeric usernames would break that. A rule to allow names that start with a number and contain some alpha was probably considered not worth the effort; instead there is just a requirement to start with an alpha character.

Another problem that may arise when using the email as username is “user harvesting” attack. For example, if you have a “change email” page or when creating new user, if the new user insert an email which is already exist then the application will have to send back an error.

While it may not be a person’s official legal name, a username makes an individual user recognizable within online communities. A username can be just as much a part of a person’s identity as the name on his or her birth certificate.

A rule to allow names that start with a number and contain some alpha was probably considered not worth the effort; instead there is just a requirement to start with an alpha character. It appears from the other responses that some distro’s have subverted this limitation; in this case, according to the GNU Core Utils documentation: