Sup,
This has been discussed before anyway. Allah means God in Arabic. How can a monotheist religion be derived from a pagan religion. HUbal had daughters as angels asthose pagans claimed and they fought Muhammad because he told them that this god of moon was false and there is only one true God creator of the universe that can not be an idol or a stone.
Al-ilah ---> single form
aliha ---> plural form
Allah--> only single and can not have a plural form. Just like elohim which is really similar to arabic word allah.
Allah clearly defined himself in the Quran as the God of everything not the Moon God. If Islam was derived from a pagan religion, then at least the moon god would have claimed to create everything and still keep the name moon god or hubal. If the moon god was Allah then muhammad wouldn't have destroyed Hubal when he took Mecca back.
And for your information. Meccans believed in Allah as creator of everything and they also believed that Hubal (moon god) was helping God rule everything.
The claim that Islam came from a pagan religion is rather funny to me. To us the God of the OT is the same God as the Quran which is the creator of everything.
The moon sign was used later hundreds of years after Muhammad, I believe that this sign resembles how we follow the moon calendar especially for determining Ramadan.