• heckel,
• hackel,
• gaeckel,
• baeckel,
• naeckel,
• jaeckel,
• uaeckel,
• yaeckel,
• hzeckel,
• hseckel,
• hweckel,
• hqeckel,
• hawckel,
• hasckel,
• hadckel,
• harckel,
• haekel,
• haeckal,
• hickel,
• hakkel

• hassel,
• hagle,
• haswell,
• Hazell,
• hassell,
• Haskell,
• heckel,
• hackle,
• hagel,
• hazel,
• Hackley,
• hackelia.

The adjective form of the word "Haeckel" is "Haeckelian".

The plural form of the word "haeckel" is "haeckels".

The singular form of the word "haeckel" is "Haeckel".