The name Zaid or Zayd is chosen by Imam Zainul Abideen for one of his sons. Zayd or Zayd Ibn Ali Ibn Al-Husain (AS) is the great grand father of Zaidi Sadat. 
‘There is a name of Zaidan in Arabic  which is from increase, but I did not find Zidan  among the known Arabic names.

Wassalam.

If he is sure that he touched the item which was in fact Najis, with a wet hand or the item was wet, then his hand became Najis even if he was unaware that it was Najis when he touched it. If he is not sure that his hand was wet or the item was wet when was touched by him, then his hand is Najis. Same also is the rule for other items touched by him later on whether he was sure that his hand was wet or the item itself was wet when it was touched by his Najis hand.

Wassalam.

I did not find any evidence supporting the claim that Imam Musa Al-Kadhim's daughter was married to a prince of Azerbaijan, nor any evidence of any son of Imam Ali Al-Ridha (AS) buried in Azerbaijan.

Those who claim that should give their evidence if they have any.

Wassalam.

'All our most knowledgeable Ulama (Maraaje' of Taqleed) say that marriage between Sayyeda believer and Nin Sayyed believer is allowed as we don't have in the authentic narrations from the Prophet (SAWA) and his Ahlul Bayt (AS) any evidence against it. They have long list if authentic narrations e.g. in Al-Kaafi , an authentic Hadeeths from Al-Hadhrami from imam Ja'far Al-Sadiq (AS) : The Prophet (SAWA) arranged the marriage between his first cousin sister Dhubaa'ah Bint Al-Zubair ibn Abdul Muttalib and Al-Miqdad ibn al-Aswad. This is a clear evidence that Miqdad ibn al-Aswad who was a Mo'min but non Sayyed was been helped by the Prophet himself (SAWA) to marry a Sayyeda Mo'mina who was the first cousin sister of the Prophet (SAWA).

We also have a Hadeeth in Al-Tahtheeb (number 1581) stating the same marriage between the Prophet;s real cousin sister and Miqdad ibn al-Aswad arranged by the Prophetvhimself (SAWA).

Wassalam.

1, Beware from the worst enemy Shaitan (Satan) who always tries to distance you from Allah and seek Allah's protection from the evil of Shaitan by repeating أعوذ بالله من الشيطان الرجيم

2. Keep on seeking from Allah and never lose hope in His Mercy and Grace.

3. Repeat Estighfaar especially at night when you are alone.

4. Repeat Salawaat as it opens the gates and treasures of every bounty in this world and hereafter.

5. Night Prayer (Salat Al-Layl or Namaz e Shab) is very important recommended prayer every night which makes you near to Allah and purifies our hearts.

6. Long Sojood (Prostration) makes you more near to Allah and more far from Shaitan.

7.  Seeking the Waseela (intercession) and Du'a if Imam Al-Mahdi (AS) is the best way to gain nearness to Allah (SWT).

Wassalam.

Using any type of sinful music is not permissible and money earned from that sinful act is also not allowed. Sinful music is the music which is usually used by sinners.

Wassalam.

Aqeeqa is recommended for every Muslim child on the seventh day after birth, and it can e be done any time after that by slaughtering a sheep or goat or cow or camel and distributing its meat to people.

Chilla has different meanings in different countries and cultures. Please clarify your question and which type of Chilla you are asking about, so that I can try to respond to it.

Wassalam.

Muslim wife must treat all the children of her husband including from other wives with justice and kindness with out any discrimination. Motherly rights are on her own children but children from other wives must keep the respect of the wives of their father. 
'Wassalam.

Direct communication with potential spouse must remain within the frame of Shariah as both of you are still Non Mahram to each other. Flirting or flirtation with a potential spouse remains Haraam till both of you enter in an Islamic contract Aqd which allows that. Chatting should never contain any emotional content before having a valid Aqd between you. If both if you want to meet, it should be in the presence of another person to avoid the Khalwah (private meeting) which is not permissible with out a valid Aqd.

Wassalam.