Analysis

The accounts Tulsi Bhagat and Tulsi Aryan both contributed to Wikidata.

All three contributed to Commons.

A merge would mean here to edit the database to edit username information for two of the three accounts to match the third.

Such database manipulation is considered as a dangerous operation, and as such, is not performed.

What we did in the past (rename only)

During the SUL migration, stewards and local bureaucrats renamed accounts to allow to create a coherent global account.

But here the request is different, you want on each wiki to merge contributions between accounts.

Alternatives

You can do the following:

• Ask to rename the main account Tulsi Bhagat to TBhagat if desired
• Note on the userpage of other accounts this is a previous legacy account for Tulsi Bhagat (or for TBhagat)
• Redirect talk pages

Declined

As such, as there is a fairly usable alternative, and as there is a risk to corrupt database, I'm sorry we aren't going to risk to corrupt histories and logs to honour such request.