How to distinguish whether the other person is male or female from the screen name?

How to tell whether the other person is a man or a woman from the screen name? Actually, this is a little regular. Boys tend to choose more atmospheric names, such as the

in the picture below, or it is related to the industry he is engaged in. For example, the first screen name above: Guilin Weichuang Computer.

Most of the screen names that girls like to choose are gentle or poetic. For example, as shown below:

or pretend to be cute. For example, the picture below

these people agree that it is a boy or a girl. The other avatar can also be seen. Unless you pretend.