I hate signing my name. I never sign anything the same way twice, and it's always a random scribble. I've actually gotten into fights with my bank over this, and before my landlord switched to electronic signatures, signing my lease every year was a huge chore due to the number of signatures involved. Maybe if I'm lucky, the first part of the scribble will look vaguely like the left half of a cursive A, but it falls apart after that. The only area where I'm consistent at all is my initials: I always write my initials as a ligature, as my initials are AJB, which easily link up. [0]
So I really envy that the Japanese can just drop down a stamp and be done with it. I've actually been considering having a custom seal made for me, either using my initials ligature (see [0]) or possibly with my name written in Japanese. I should explain the latter: I decided a while back that if I ever need to write my name in Japanese, instead of rendering my name in katakana [1], I'd use a Japanese name that has similar sound/meaning to my own [2].
[0] The main one I use, and an alternative I've been experimenting with https://i.imgur.com/Z30PLre.jpg
[1] Amy Book -> エイミー・ブック
[2] 本えみ <- 本 is the kanji for "Book", and in my name I prefer to read it as もと (Moto), and えみ is Emi (written in hiragana, which is a syllabary that carries no semantic meaning), a fairly common Japanese name that sounds similar to Amy.