From Lexicanum

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The Wolf Lord is part of the Space Wolves chapter and is chosen from that company’s Wolf Guard. It is his duty to organise and lead his Great Company. He is the equivalent of a Captain in other chapters. When a Wolf Lord dies, his Great Company picks a successor from the Wolf Guard. The Wolf Lord of the leading Great Company is known as the Great Wolf.¹

The current Wolf Lords are:

• Bran Redmaw, Sigil is the Bloodied Hunter²
• Engir Krakendoom, Sigil is the Sea Wolf²
• Erik Morkai, Sigil is the Deathwolf²
• Gunnar Red Moon, Sigil is the Red Moon²
• Logan Grimnar, The Great Wolf²
• Harald Deathwolf, Sigil is the Ravening Jaw²
• Bjorn Stormwolf, Sigil is the Thunderwolf²
• Egil Iron Wolf²
• Krom Dragongaze, Sigil is the Sun Wolf²
• Ragnar Blackmane²
• Sven Bloodhowl, Sigil is the Fire Breather²
• Kjarl Grimblood, Sigil is the Fire Wolf²

Sources

• ¹:Codex: Space Wolves (3rd Edition) p32
• ²:Codex: Space Wolves (5th Edition) p16-17