• prego,
• greak,
• greg,
• groug,
• regu,
• greww,
• greec,
• regga,
• creig,
• grengo,
• garege,
• groge,
• greul,
• regi,
• gragh,
• grage,
• gregoy,
• greeg,
• regge,
• greag

• greek,
• Grise,
• grogg,
• grog,
• gries,
• grace,
• Grego,
• grouse,
• Grayce,
• greig,
• Griego,
• grieco,
• groce,
• griese,
• graze,
• griggs,
• Greg,
• greggs,
• grose,
• gragg,
• Graig,
• grease,
• Grice,
• grigg,
• greece,
• Grosse,
• grieg,
• groggy,
• Gracie.

The adjective form of the word "Gregg" is "Greggian".

The plural form of the word "Gregg" is "Greggs".

The singular form of the word "Gregg" remains the same, as it is already singular.