In fact, you can use some scenery or short sentences to imagine.
For example, mine: Qingye, when I woke up, I thought of the fields under the sunny sky, Meng Wuyan, Winter goes to spring and my swallow returns, Autumn words, Autumn whispers (speech), or go through hundreds of pages The family name Hahahahaha can also be based on a certain research object as a reference, that is, first find the appropriate image element and then follow this element.
For example, Kuro's element is a cat with black hair and eyes, so he is called Nekoyashiki Kuro.
Or if you get some inspiration from reading, it is also suitable to spell the name into a nice and little-known OC name.