In a book, it says:
"126– It causes Kufr (disbelief) to say Abdulkoydur instead of AbdulQâdir when said intentionally. So is the case with saying Abdo instead of Abduluzeyz, Memo instead of Muhammad, Hasso instead of Hasan, and Ibo instead of Ibrâhîm. Some tradesmen write these blessed names on shoes or slippers for advertisement because they are their names, and those who buy them put them on their feet, and, hence, step on them. There is the fear that both those who write them and those who step on them will lose their faith."
Now, in my language, it is a sign of attachment if someone calls a friend ibo instead of ibrahim. Is this impermissible? I have read this in a book in which there were some things I have doubts about. Can you check this and answer me? Is it right to listen the things which are Kufr? Must a man know all of them? The link for the book is (starting from page 189): http://www.hakikatkitabevi.net/book.php?bookCode=190

All perfect praise be to Allah, The Lord of the worlds. I testify that there is none worthy of worship except Allah and that Muhammad is His slave and Messenger.

It is very clear that your question stems from Waswaas (obsessive whisperings) about the matter of Kufr – like your previous questions – and if you want to reassure your heart and feel comforted, then you must absolutely ignore these whisperings, not pay any attention to them, and stop asking about them, while asking Allah to relieve you from them.

Therefore, we do not want to elaborate in answering your question, because this will not benefit you greatly with your whisperings.

We advise you to learn Islamic knowledge in a correct manner, to do so gradually, and to seek knowledge from reliable and trustworthy books from the scholars. As regards jumping to issues of Takfeer (declaring a Muslim to be a disbeliever), then it is most likely that this would lead you to be misled and misguided.

Allah knows best.