İf interesting to change block name, use this autolisp program..
Code:
;*******************************************
;
; Rename block name
; (change block name)
;
;*******************************************
(defun c:rbk (/ blkselect )
(setq blkselect (entget(car(entsel "Select block to view NAMES : ")))
blkname (cdr(assoc 2 blkselect)) )
(princ (strcat "->>> " (cdr (assoc 2 blkselect)) " <<<-" ))
(setq blknew (getstring t "\nEnter new block name: "))
(command "_.rename" "_block" blkname blknew)
(prompt "\nYour block name renamed...")
(princ)
)
(Princ "Use command > rbk < to change block name !")