The females in mermen tribes were shared by the entire tribe. Every merman had the right to mate with the female. Although the numbers of these mermen had been expanded by him and An'an and they didn't receive any external disturbances and everything was within his control, it was hard to guarantee that they wouldn't have a change of heart.
Take now for example.
"Daddy, we've already come of age. Where should we go to look for a mate?" Silver, the most outstanding amongst the little mermen, raised this question to Bluepool.
Silver was a merman whose body was completely snow-white. His facial features were exquisite and cold, looking like a mobile ice statue. Just looking at him would make one shiver from the cold.
The number of mermen was too high, and it was impossible for them to come up with so many names. Therefore, they were named after their colors. Like their surnames.