Hi,
1°) "At the time when the Normans invaded Muslim Sicily, the major cities (Palermo, Syracuse etc) were governed by different ‘emirs’ which the Normans conquered one after the other."
No, major cities of Sicily were not governed by "Emir". Emir is a specific title and no governors take the title.
After 1091, the period is called "Taifa". In this period, like you said, Sicily was multi cultural, and some cities were governed by arab :
Abdallah ibn Mankut - Trapani and Mazara (1053–?)
Ibn al-Maklatí - Catania (1053–?)
Muhammed ibn Ibrahim (Ibn Thumna) - Syracuse (1053–1062) and in later years Catania and Trapani/Mazara
Alí ibn Nima (Ibn al-Hawwàs) - Agrigento and Castrogiovanni (1053–about 1065), all Taifas from 1062
Ayyub ibn Tamim (Zirid) (about 1065–1068)
Ibn al-Ba'ba, Palermo (1068–1072)
Hammad - Agrigento and Castrogiovanni (1068–1087)
Ibn Abbad (Benavert)- Syracuse and Catania (1071–1086)
So culturemalta used the right word : Hakim, and not "Emir"
2°) So no maltese historians never wrote down this names, weird, don't you think ?
3°) So why if you take the emirs of Sicily :
al-Hasan al-Kalbi (948–953)
Ahmad ibn al-Hasan al-Kalbi (954–969)
Ya'ish (969-970)
Abu'l-Qasim Ali ibn al-Hasan al-Kalbi (970–982)
Jabir al-Kalbi (982–983)
Ja'far al-Kalbi (983–985)
Abdallah al-Kalbi (985–990)
Yusuf al-Kalbi (990–998)
Ja'far al-Kalbi (998–1019)
al-Akhal (1019–1037)
Abdallah (1037–1040), Zirid usurper
Hasan as-Samsam (1040–1053)
From 948 to 1053, there only one "duplicate" : Ja'far al-Kalbi ?
Why that ? No hommage ? No respect in this period ?
No always the father / son. We can see that the fourth emir Abu'l-Qasim Ali ibn al-Hasan al-Kalbi, seems to be the brother of the second Ahmad ibn al-Hasan al-Kalbi and the son of the first al-Hasan al-Kalbi.
So in Sicily history, it's no so simple, the son isn't always the successor.
It's not because it's "common" that it will become just "perfect" on a specific family ?
Many time, it's not the elder who take the "crown"
4°) Do you try to find the "story" of the wifes ?
I see a "Princess Euphrosyne Angelos" for the last emir.
You can find her on wikipedia :
https://en.wikipedia.org/wiki/Euphrosyne_Kastamonitissa
"Euphrosyne Kastamonitissa wife of Andronikos Doukas Angelos"
Oh, so she remaried ? Weird she died in 1186, a little too early for be the wife of the "last emir of malta"
5°) Maybe you need to try to find others sources
6°) The original name ? The original name of a person is the name used when he was alive.
The potential of an ancestor, 400 years before are the original name of that person.
For malte surnames origin, Mario CASSAR is an expert
You can contact him on facebook :
https://www.facebook.com/mario.cassar.52