The origin of the word “Al-Andalus”
The origin of the word al-andalus is still not approved by linguists and historians.
The etymology of the name Al-Andalus is unknown. This name was used to refer to the Iberian peninsula or the South Iberian region that was controlled by Muslims, and the earliest evidence of this name was on coins printed by the Islamic government in Iberia around 715 (the year of printing was also uncertain because coins were written in Latin and Arabic, and both give different years). There are at least three etymological theories that have been proposed by Western scientists, all of whom consider that this name originated in the days of Roman rule on the Iberian Peninsula.
The first theory is that the name came from Vandal, a German tribe that ruled parts of Iberia during 407-429. One of the scientists who accepted this theory was Reinhart P. Dozy, 19th century historian.  The second theory is derived from the Arabization of the word “Atlantic”. Supporters of this theory are Spanish historian Vallvé.  The third theory proposed by Halm (1989) is that this name originated from the name given by the Visigoths who ruled Iberia in the 5th to 9th century. In Latin, Iberia Visigoth is called Gothica Sors (Goth lottery land). Halm predicts that in Gothic the “lottery land” might be called * landahlauts, and he suggested from where the name Al-Andalus originated.
These three theories all have no historical evidence, so they can be said to be very weak. The pioneers and defenders of these three theories are all historians. But lately, linguists have been included in this discussion. Arguments from history, linguistics and toponymy (the study of regional names), then show the weaknesses of all the theories above, and that the name Al-Andalus was originally from Roman times.
The long history passed by Muslims in Iberia can be divided into six periods, where each period has its own style of government and community dynamics. Since it first set foot on Spanish soil until the fall of the last Islamic government there, Islam played a very big role.