Truenaming/truespeaking isn't from the same book as soul melds, if you're talking about D&D 3.5, though pacts and shadow magic were in the same book. There is a words of power optional ruleset in Pathfinder but it's not at all similar.
If you're interested there's a 3rd party product which brought something similar to pacts & binding to PF and some more which were based off Magic of Incarnum (the book with soul melds). If there's anything based off truespeaking it was obscure enough that I haven't noticed it.
Truenaming as part of Strange Magic by Interjection Games.
Awww I was hoping they would bring it back :( what other of books do they have on construction like DnD did with stronghold building the costs the personal needed etc collecting taxes entire government building
Closest would be Ultimate Campaign, although it's not specifically equivalent and covers a broader range of downtime activities.
Ultimate Magic has Words of Power in Chapter 4 and deals with binding outsiders via their True Name in Chapter 2. You won't find a class that specifically uses the 3.5e version of the Truenamer in Pathfinder outside of 3rd party material, however.