First of all, I want to clarify that I speak from experience when I say that it is not advisable to record your name or any other text on the body of an iPad, an iPod or any other Apple mobile device. Next I give you the reasons not to, despite being free and making that product something more personal and unique.
Apple engravings. The Trap Against Second Hand Selling
Think about it, the company that sells you an iPhone or an iPad for more than € 700 offers you free of charge to include a engraved and indelible text on your device. An added value to increase brand loyalty and satisfy users? Yes, sure, but it is also a way to avoid being able to sell it in second-hand applications and markets. Perhaps, despite having your name or a text engraved on the device, you will get someone to buy it for you, but it will be much more difficult.
Almost two years ago I bought an iPod Shuffle online at the Apple Store and decided to put a free engraving on it. What a good idea, of course. And what do I write? "This is my iPod, not yours" or "Think Different" is very funny, but I decided to opt for my Twitter username and my nickname as a writer: "Josekopero". At first I loved it. All perfect. But now that I have Apple Music and a 6Gb iPhone 64 I can do without the iPod. I already told you that the iPod as a device was dead. It occurred to me to even sell it, but I found a problem. Indeed, it has my name, so I have to eat it. I can't sell it like that.
I ended up adding versions of songs and mixes downloaded from YouTube to give it a differentiated value from my devices with iOS. In some I have the music with Apple Music and in the iPod only some specific songs downloaded that I sometimes listen to. The point is that because I have put the engraving on it, I can't sell it.
Therefore, I recommend that you do not record anything on an iPad or any other device. Over time you will want to sell it or give it to someone and it may be impossible or very difficult. Better customize the wallpaper or cover.