Larum soundalikes could include:

Similar Syllable Structure & Sound:

• Larim
• Larom
• Lareem
• Laurum
• Larium
• Lareum
• Laremy
• Laramy
• Larumby (adding a playful suffix)
• Larune (slightly altering the vowel sound)

Variations on Consonant Sounds:

• Harum
• Carum
• Rarum
• Darum
• Barum

Variations on Vowel Sounds:

• Lareem
• Laroom
• Laream

More Evocative/Thematic Variations (assuming a need for a specific feel):

• If aiming for a more mystical feel: Lyrium, Larium, Alorum
• If aiming for a more modern/tech feel: Larun, Larin, Larem
• If aiming for a more classic/elegant feel: Laren, Larin, Laurum

This list provides a range of options, playing with different phonetic elements of the original name "Larum." The best choice will depend on the specific context and desired effect.