The best answer for that question is The Surah of Al Ikhlas.
1. Say: He is Allah, the One;
2. Allah, the Eternal, Absolute;
3. He begetteth not, nor is He begotten;
4. And there is none like unto Him.
According to those verses and other verses mentioned in the Qur’an, the claims mentioned in the question are wrong and is a slander to Allah. The claim of “Allah’s daughters” is a slander like that, too..
“And they make into females angels who themselves serve Allah. Did they witness their creation? Their evidence will be recorded, and they will be called to account!” (Az-Zukhruf, 43/19)
Angels were described as female by the polytheists of Kuraysh according to the meaning of that verse.
Today, the fact that Christians characterize angels as female and (Allah is far from it) say that angels are His daughters is a concept that came from and was shaped by old superstitions.
As a matter of fact, a considerable portion of the Christian actors are far from religion. They are not concerned with whether what they are doing is suitable for their religion or not.
In addition, their faith of the “trinity” which is composed of the coalition of Mary-Jesus-Holy spirit can comply with that.
The ayahs (verses) warning those who slander to Allah by saying “Angels are daughters of Him” are as follow:
“Those who believe not in the Hereafter, name the angels with female names.” (An-Najm, 53/27)
“Has then your Lord (O Pagans!) preferred for you sons, and taken for Himself daughters among the angels?” (Al-Isra, 17/40)
“Now ask them their opinion: is it that their Lord has (only) daughters, and they have sons?- Or that We created the angels female, and they are witnesses (thereto)?” (As-Saffat, 37/149-150)
As for the name “Allah”:
The name “Allah” has not been derived and taken from any other languages into Arabic. It is used as a proper name from the beginning. Almighty Allah’s personality is present before His all names and attributes, so too, is the name “Allah”. One of the proofs that indicates the name “Allah” is Arabic is this: If it had been taken from any other languages, it would have been used as qhayri munsarif (Arabic origin verb that is suitable for inflexional suffix) such as; Israfil, Gabriel, Abraham, Ishmael. However, it is not used like munsarif nouns. (Arabic origin verbs which are suitable for inflexional suffix)
Shortly, it is not possible under these conditions to claim that the name “Allah” had been derived from another language.
That exalted name, from the aspect of the language too, is in an eternal curtain. In order to have the simplest meaning, the word to be said is amazement and greatness. Allahu Akbar! (Allah is the greatest!)
Some features of the name “Allah”.
1. The name Allah is the most mentioned name in the Qur’an; it is mentioned 2697 times.
2. That holy name includes all of the other meanings of the names of Almighty Allah.
3. The name Allah is a proper noun that indicates divinity. His other names called Asmau’l Husna (the most beautiful names of Allah) are in fact His attributes. And all of these names are attributed to Him. For example, it is said: “Allah is Ghafoor, Raheem, Hakeem, etc”. And the verbs of these attributes are attributed to Him, too. Such as “Allah blessed mercy, He blesses mercy, O Allah mercy upon me, Allah sees, hears, knows, etc”.
4. Both of the “lam”s (One of the Arabic letters which indicates the letter “l”.) which are in the name “Allah” are pronounced as dark “l” –contrary to the other nouns including “lam”- to honor Allah.