Spell of Malaysia and Indonesia in Arabic.
why we have to spell 'Indonesia' as 'اندونيسيا' where it has to use س for 's' but why we have to spell 'Malaysia' as 'ماليزيا' and ز is used for 's'?

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This is a foreign term to arabic so it can be spelled anyway as long as it respects the prononciation of the original term

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because names of countries varies from one language to another ... in arabic Malaysia is Maliziya and Indonesia is Andenosia  ... thats why Z or ز replaces the S or س in malaysia .... .... i will give u an example :

France is France in english , Faransa in arabic , while its Perancis in your language

hope u got my point :)

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well , i don't really know ,
but countries names in arabic are not necessary diven from the english names ,

ex: egypt  in arabic  is "misr"
                                          مصر

russia  in arabic is "rosia"
                                      روسيا
china in arabic is "el sin"
                                 الصين
i think it is the same for other languages also , english names are not the standard.