As the Arabic script can only be translated into Roman script phonetically there is no 'official' spelling of the city's name in English.

I have seen it spelt Macca, Mekka, Makka, Makkah and Mecca. The most common usage is Mecca - which I have used direct from the article.

Nice to see you follow your tag of a 'Chill Life' - so much hostillity at the out-set. Calm down dear!