Hi! I currently saw the Korean drama "My name's Kim Sam Soon"

I really really love it! hehe
Anyway, In the drama, many people often sneered her name "Sam Soon". Why did people think its strange?? Was it sort of,,, rare name ??Or Did it sound strange meaning??
And the name Hee Jin is generally concidered nice or is it popular name in Korea??
Please do tell me I can't even sleep with thinking about that!!!
thank youu! Kamsahamnida!