Seleucus was the name of several Macedonian kings of the Seleucid dynasty ruling in the area of Syria:

• Seleucus I Nicator (Satrap 311–305 BC, King 305 BC–281 BC)
• Seleucus II Callinicus (246–225 BC)
• Seleucus III Ceraunus (or Soter) (225–223 BC)
• Seleucus IV Philopator (187–175 BC)
• Seleucus V Philometor (126/125 BC)
• Seleucus VI Epiphanes Nicator (96–95 BC)
• Seleucus VII Kybiosaktes or Philometor (70s BC–60s BC?)

as well as that of a Greek astronomer:

• Seleucus of Seleucia

Seleuco | Seleuco | סלאוקוס | Seleukos | Seleuco