叫 = 口 (mouth) + 丩 (a twisting shape, for the sound). Anything you do with a raised voice carries the mouth radical, so 叫 means to call out, to shout — and, gently, 'to be called / named'.
叫 powers the single most useful sentence for a beginner: 你叫什么名字? — literally 'you are-called what name?' = 'What's your name?' You answer 我叫… (I'm called…). 叫 also means to shout or to summon: 叫他 (call him over), and even animal sounds — a dog 叫 (barks). With 叫, 什么, and 名字 (all now learned), you can introduce yourself to anyone in China.
A mouth (口) calling out — to CALL, to be NAMED.
你叫什么名字? ('What are you called?') is THE first sentence to learn in China. Answer: 我叫… With 叫 + 什么 + 名字, you can now ask and answer it.