The 13th Tirthankar of the current time-cycle (Avasarpini) is:

Bhagwan Vimalnath (Vimalanatha).

Brief details:

• Number: 13th of the 24 Tirthankars
• Symbol (Lanchan): Boar (varāh)
• Tradition: Accepted as the 13th Tirthankar in both Digambar and Shwetambar Jain traditions

You can see the full list of 24 Tirthankars here