Is circumcision a condition for entering Islam, and is it obligatory to change one's name upon converting, and what is the most suitable name among "Qasim, Asim, Taym Allah, Said"?

If circumcision does not cause harm, it may be performed by a skilled surgeon. If it does cause harm, there is no objection to omitting it, and this will not affect one's Islam. As for changing the name, the most beloved names to Allah are "Abdullah" and "Abdul Rahman." If you wish a name from the list, you may name yourself "Asim," which means protector or preserver.